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How to Use ChatGPT: The Complete Guide to OpenAI's AI Assistant
Everything you need to know to get real value from ChatGPT, from your first conversation to advanced features like Deep Research, image generation, and Custom GPTs.
28 February 2026
chatgpt
openai
platform
Create a free account at chatgpt.com and explore the interface - chat input, sidebar, model selector, and file attachments
Set up Custom Instructions in Settings to personalise every conversation with your role, preferences, and output style
Master iterative prompting: start broad, refine with follow-ups, and ask ChatGPT to critique and improve its own output
Use Deep Research for comprehensive web research that produces cited reports in minutes instead of hours
Try Custom GPTs from the GPT Store for specialised tasks, or build your own for repetitive workflows
Why This Matters
ChatGPT reached 300 million weekly active users in early 2025, making it the fastest-growing consumer application in history. But most people barely scratch the surface of what it can do. Whether you're using the free tier or paying for Plus, understanding how to prompt effectively, leverage advanced features like Deep Research and Code Interpreter, and build Custom GPTs for repeatable workflows will transform ChatGPT from a novelty into a genuine productivity multiplier.
Visit chatgpt.com to get started. This guide covers the free and paid tiers, so you can follow along regardless of your plan.
Visit chatgpt.com to get started. This guide covers the free and paid tiers, so you can follow along regardless of your plan.
How to Do It
1
Create your account
Head to chatgpt.com and sign up with your email, Google, or Apple ID. The free tier gives you access to GPT-4o mini with limited daily messages.
2
Set up Custom Instructions
Go to Settings > Personalisation > Custom Instructions. Tell ChatGPT your role, preferences, and how you want responses formatted. This context applies to every new conversation automatically.
3
Learn the interface
The chat input is at the bottom, conversation history on the left sidebar, and the model selector at the top. Click the + button to attach files (PDFs, images, spreadsheets).
4
Write your first effective prompt
Be specific: include your role, the task, the format you want, and any constraints. For example: 'You are a copywriter. Write 3 email subject lines for a SaaS product launch targeting CTOs. Keep each under 50 characters.'
5
Iterate and refine
Don't accept the first response. Ask ChatGPT to critique its own output, then refine. Say 'Make it more concise' or 'Rewrite this for a less technical audience'. Two rounds of iteration usually gets you to quality output.
6
Explore advanced features
Try Deep Research for comprehensive web research with citations. Use DALL-E for image generation. Upload a CSV and ask for analysis using Code Interpreter. Each feature unlocks new workflows.
7
Build a Custom GPT
Go to chatgpt.com/gpts/editor to create a GPT with specific instructions, uploaded knowledge files, and custom behaviour. Share it with your team or publish it to the GPT Store.
What This Actually Looks Like
The Prompt
You are a senior product manager at a B2B SaaS company. I need to write a PRD (Product Requirements Document) for a new feature: AI-powered email triage that automatically categorises and prioritises incoming support emails. Structure the PRD with these sections: Problem Statement, User Stories (3-5), Requirements (must-have vs nice-to-have), Success Metrics, and Timeline Estimate. Keep it concise but thorough. Use bullet points for requirements. The audience is engineering leads and the VP of Product.
Example output — your results will vary based on your inputs
Product Requirements Document: AI Email Triage
Problem Statement
Our support team processes 2,400+ emails daily. Manual triage takes an average of 45 seconds per email, consuming 30 hours of team capacity weekly. Mis-categorisation leads to 18% of tickets being routed to the wrong team, increasing resolution time by 2.3x.
User Stories
- As a support agent, I want incoming emails automatically categorised by topic so I can focus on resolution instead of sorting.
- As a team lead, I want priority scoring based on sentiment and urgency so critical issues surface immediately.
- As a support agent, I want suggested response templates based on email category so I can reply faster.
Requirements
Must-have: Auto-categorisation into 8 existing support categories (95%+ accuracy), priority scoring (P1-P4), integration with Zendesk API, real-time processing (<5 seconds per email).
Nice-to-have: Suggested response templates, sentiment trend dashboard, custom category training.
Success Metrics: Triage time reduced from 45s to <5s per email. Mis-routing reduced from 18% to <5%. Support team capacity freed: 25+ hours/week.
Timeline: 6-week sprint. Week 1-2: ML model training. Week 3-4: API integration. Week 5-6: Testing and rollout.
Problem Statement
Our support team processes 2,400+ emails daily. Manual triage takes an average of 45 seconds per email, consuming 30 hours of team capacity weekly. Mis-categorisation leads to 18% of tickets being routed to the wrong team, increasing resolution time by 2.3x.
User Stories
- As a support agent, I want incoming emails automatically categorised by topic so I can focus on resolution instead of sorting.
- As a team lead, I want priority scoring based on sentiment and urgency so critical issues surface immediately.
- As a support agent, I want suggested response templates based on email category so I can reply faster.
Requirements
Must-have: Auto-categorisation into 8 existing support categories (95%+ accuracy), priority scoring (P1-P4), integration with Zendesk API, real-time processing (<5 seconds per email).
Nice-to-have: Suggested response templates, sentiment trend dashboard, custom category training.
Success Metrics: Triage time reduced from 45s to <5s per email. Mis-routing reduced from 18% to <5%. Support team capacity freed: 25+ hours/week.
Timeline: 6-week sprint. Week 1-2: ML model training. Week 3-4: API integration. Week 5-6: Testing and rollout.
How to Edit This
Notice how the prompt specified the role (product manager), deliverable (PRD), structure (5 sections), format (bullet points for requirements), and audience (engineering leads). Each constraint reduced ambiguity and improved the output. Try replacing the feature description with your own to generate a PRD for your product.
Prompts to Try
Draft a Strategy Document
You are a senior strategy consultant. I need a competitive analysis of [INDUSTRY] in [REGION]. Structure it as: 1) Market overview with key players, 2) Emerging trends and disruptions, 3) Opportunities for a new entrant, 4) Recommended positioning strategy. Use a professional but accessible tone. Include specific data points where possible.
What to expect: A well-structured 800-1200 word strategy document with headings, bullet points, and actionable recommendations. The output improves dramatically when you specify your industry and region rather than leaving them generic.
Analyse and Visualise Data
I'm uploading a CSV of [DESCRIBE YOUR DATA]. Please: 1) Summarise the key patterns and outliers, 2) Create 3 charts that tell the most important story in this data, 3) Identify any data quality issues, 4) Suggest 3 follow-up analyses worth running. Explain your findings as if presenting to a non-technical executive.
What to expect: ChatGPT will use Code Interpreter to process your file, generate Python charts inline, and provide a narrative summary. Upload the actual file using the + button for best results.
Build a Custom GPT for Your Team
Help me create a Custom GPT for [YOUR USE CASE]. I want it to: 1) Always respond in [TONE/STYLE], 2) Have expertise in [DOMAIN], 3) Follow these rules: [LIST YOUR RULES], 4) Use this reference material: [PASTE OR DESCRIBE]. Generate the system instructions I should paste into the GPT Builder.
What to expect: A complete set of system instructions ready to paste into the Custom GPT builder at chatgpt.com/gpts/editor. You'll get a structured prompt with role definition, behaviour rules, and output formatting.
Common Mistakes
Vague prompting
Writing prompts like 'help me with marketing' instead of specifying your audience, format, tone, and constraints. Specific prompts get dramatically better results.
Not using conversation context
Starting a new chat for every question instead of building on context. ChatGPT gets better the more context it has within a conversation.
Ignoring Custom Instructions
Not setting up persistent preferences means ChatGPT starts from scratch every time. Spend 5 minutes configuring Custom Instructions to save hours.
Treating output as final
Accepting the first response without iterating. The best results come from 2-3 rounds of refinement and feedback.
Using the wrong model for the task
Sticking with GPT-4o mini for complex analysis when GPT-4o or Deep Research would produce significantly better results. Match the model to the task complexity.
Tools That Work for This
ChatGPT Plus
Full access to GPT-4o, Deep Research, image generation, and Advanced Voice for US$20/month
Custom GPTs
Pre-configured ChatGPT instances with specific instructions, knowledge files, and API integrations
Canvas
Side-by-side collaborative editor for long-form writing and code editing
ChatGPT API
Programmatic access for developers building applications, automations, and integrations
Getting Started: Your First 10 Minutes with ChatGPT
Head to chatgpt.com and create a free account with your email, Google, or Apple ID. The free tier gives you access to GPT-4o mini with limited messages per day - enough to explore the basics.
The interface is clean: a chat input at the bottom, conversation history on the left sidebar, and model selector at the top. Type your first message and hit Enter. ChatGPT responds in seconds.
A few things to try straight away:
- Ask it to summarise a long article (paste the text in)
- Ask it to draft an email based on bullet points you provide
- Ask it to explain a concept you're learning about
- Upload an image and ask it to describe or analyse what it sees
The key insight most people miss: ChatGPT is a conversation, not a search engine. If the first response isn't quite right, tell it what to change. Say 'make it shorter', 'use a more formal tone', or 'focus on the cost benefits instead'. This iterative approach produces far better results than trying to write the perfect prompt on the first attempt.
The interface is clean: a chat input at the bottom, conversation history on the left sidebar, and model selector at the top. Type your first message and hit Enter. ChatGPT responds in seconds.
A few things to try straight away:
- Ask it to summarise a long article (paste the text in)
- Ask it to draft an email based on bullet points you provide
- Ask it to explain a concept you're learning about
- Upload an image and ask it to describe or analyse what it sees
The key insight most people miss: ChatGPT is a conversation, not a search engine. If the first response isn't quite right, tell it what to change. Say 'make it shorter', 'use a more formal tone', or 'focus on the cost benefits instead'. This iterative approach produces far better results than trying to write the perfect prompt on the first attempt.
Prompting Like a Pro: Techniques That Actually Work
Once you're comfortable with basic chat, explore the features that make ChatGPT genuinely powerful:
Custom Instructions let you set permanent preferences — your role, communication style, and context — so ChatGPT remembers them across every conversation. Find this in Settings > Personalization.
GPTs (custom chatbots) are pre-configured versions of ChatGPT built for specific tasks. Browse the GPT Store for writing assistants, coding helpers, data analysts, and more. You can also build your own GPT with no coding required.
Code Interpreter (Advanced Data Analysis) lets ChatGPT write and execute Python code, process uploaded files (CSV, Excel, PDF), create charts, and perform complex calculations. Upload a spreadsheet and ask it to 'find trends in this data' — it'll write the code, run it, and explain the results.
DALL-E Integration generates images directly in the chat. Type 'create an image of...' and ChatGPT produces it using DALL-E 3. You can iterate on the image with follow-up instructions like 'make the background blue' or 'add more detail to the face'.
Browse with Bing gives ChatGPT access to current web content when you need up-to-date information, prices, or recent events.
Custom Instructions let you set permanent preferences — your role, communication style, and context — so ChatGPT remembers them across every conversation. Find this in Settings > Personalization.
GPTs (custom chatbots) are pre-configured versions of ChatGPT built for specific tasks. Browse the GPT Store for writing assistants, coding helpers, data analysts, and more. You can also build your own GPT with no coding required.
Code Interpreter (Advanced Data Analysis) lets ChatGPT write and execute Python code, process uploaded files (CSV, Excel, PDF), create charts, and perform complex calculations. Upload a spreadsheet and ask it to 'find trends in this data' — it'll write the code, run it, and explain the results.
DALL-E Integration generates images directly in the chat. Type 'create an image of...' and ChatGPT produces it using DALL-E 3. You can iterate on the image with follow-up instructions like 'make the background blue' or 'add more detail to the face'.
Browse with Bing gives ChatGPT access to current web content when you need up-to-date information, prices, or recent events.
Advanced Features: Deep Research, Codex, Images, and Voice
To get consistently great results from ChatGPT, focus on these proven techniques:
Be specific about format and length. Instead of 'write about marketing', say 'write a 300-word LinkedIn post about content marketing for B2B SaaS startups, with 3 actionable tips and a conversational tone'.
Provide context and examples. The more ChatGPT knows about your situation, audience, and goals, the better its output. Paste examples of writing styles you like, share your brand voice guidelines, or describe your target audience in detail.
Use system-level framing. Start conversations with 'You are a...' to set ChatGPT's role. For example: 'You are an experienced copywriter who specialises in email marketing for e-commerce brands. Help me write a welcome email sequence.'
Chain your requests. Break complex tasks into steps. Ask ChatGPT to first outline, then draft, then refine. Each step builds on the last, producing much better results than a single prompt.
Save and reuse what works. When you find a prompt that produces great results, save it. Build a personal library of effective prompts for tasks you do regularly — this is where the real time savings compound.
Be specific about format and length. Instead of 'write about marketing', say 'write a 300-word LinkedIn post about content marketing for B2B SaaS startups, with 3 actionable tips and a conversational tone'.
Provide context and examples. The more ChatGPT knows about your situation, audience, and goals, the better its output. Paste examples of writing styles you like, share your brand voice guidelines, or describe your target audience in detail.
Use system-level framing. Start conversations with 'You are a...' to set ChatGPT's role. For example: 'You are an experienced copywriter who specialises in email marketing for e-commerce brands. Help me write a welcome email sequence.'
Chain your requests. Break complex tasks into steps. Ask ChatGPT to first outline, then draft, then refine. Each step builds on the last, producing much better results than a single prompt.
Save and reuse what works. When you find a prompt that produces great results, save it. Build a personal library of effective prompts for tasks you do regularly — this is where the real time savings compound.
Frequently Asked Questions
Yes, ChatGPT has a free tier with access to GPT-4o mini and limited GPT-4o messages. ChatGPT Plus costs US$20/month and gives you more messages, faster responses, and access to all features including Deep Research and Advanced Voice. ChatGPT Pro at US$200/month provides unlimited access to all models and features, plus extended thinking for complex reasoning tasks.
ChatGPT Plus and Pro do not use your conversations to train models (you can verify this in Settings > Data Controls). For enterprise use, ChatGPT Team (US$25/user/month) and Enterprise plans offer additional security guarantees, admin controls, and compliance certifications. Never paste genuinely sensitive data (passwords, API keys, personal identifiable information) into any AI tool.
ChatGPT is the product - the chat interface, mobile apps, and features like Custom GPTs and Deep Research. GPT-4o is one of the AI models that powers ChatGPT. Think of ChatGPT as the car and GPT-4o as the engine. ChatGPT can use different models (GPT-4o, GPT-4o mini, o1, o3) depending on the task and your subscription tier.
Next Steps
Start by setting up Custom Instructions with your role and preferences. Then try Deep Research on a real work question - the quality will surprise you. Build your first Custom GPT for a task you repeat weekly. Join the ChatGPT community forums to discover workflows from other professionals in Asia-Pacific.