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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.
AI Snapshot
- ✓ 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
**ChatGPT** changed the world when it launched in November 2022, and it hasn't slowed down since. Now at version 5.2, OpenAI's flagship AI assistant handles everything from drafting emails and analysing data to generating images, conducting **deep research**, and even writing production code. Whether you're a complete beginner or someone who's been using it casually and wants to unlock its full potential, this guide covers everything you need to know.
**[Open ChatGPT →](https://chatgpt.com)**
Browse more prompts for ChatGPT in our [Prompt Library](/prompts).
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
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
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
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
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
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
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
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.
Prompt Templates
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.
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.
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.
Research
I need comprehensive research on [industry/topic] in [specific Asian market]. Please investigate: current market size and growth projections, top 5 competitors with their market share, regulatory landscape and recent policy changes, consumer trends and adoption rates, and key opportunities and risks. Cite all sources with URLs. Format as an executive briefing with an executive summary at the top.
Writing
You are a senior content strategist writing for [audience]. Write a [content type] about [topic]. Requirements: British English, professional but conversational tone, no jargon unless explained, include 3 real-world examples relevant to Asia-Pacific markets, conclude with actionable next steps. Length: [word count]. Format with clear subheadings.
Analysis
I'm uploading a [file type] containing [description of data]. Please: 1) Summarise the key statistics and identify patterns, 2) Create 3 visualisations that tell the most important story in this data, 3) Highlight any anomalies or outliers, 4) Provide actionable recommendations based on the analysis. Export the charts as images I can use in a presentation.
Common Mistakes
⚠ Vague prompting
⚠ Not using conversation context
⚠ Ignoring Custom Instructions
⚠ Treating output as final
⚠ Using the wrong model for the task
Recommended Tools
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
FAQ
What's the difference between ChatGPT Free and Plus?
ChatGPT Plus ($20/month) gives you unlimited GPT-4o access, priority during peak times, and advanced features like Deep Research, DALL-E image generation, and Custom GPTs. The free tier limits you to GPT-4o mini with daily message caps, but it's still powerful enough for most basic tasks.
Can ChatGPT access real-time information?
ChatGPT's training data has a cutoff date, but ChatGPT Plus users can enable web browsing or use Deep Research for current information. For breaking news or real-time data like stock prices, always verify information independently as AI can sometimes provide outdated or incorrect details.
Is it safe to share sensitive business information with ChatGPT?
OpenAI states they don't use conversations from ChatGPT Plus subscribers to train their models, but avoid sharing confidential data like passwords, personal details, or proprietary business information. For sensitive work, consider using OpenAI's enterprise solutions or local AI alternatives.
Why does ChatGPT sometimes give different answers to the same question?
ChatGPT uses probability to generate responses, so slight variations are normal and often beneficial for creative tasks. If you need consistent outputs, be more specific in your prompts or use Custom GPTs with detailed instructions to standardise responses for particular workflows.
Can I use ChatGPT for my business in Singapore/Australia/other APAC countries?
Yes, ChatGPT is available across most Asia-Pacific markets including Singapore, Australia, Japan, and South Korea. Check OpenAI's country availability list for your specific region, and consider local data protection laws when using AI tools for business purposes.
Is ChatGPT free to use?
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.
Is ChatGPT safe to use for business?
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.
What's the difference between ChatGPT and GPT-4o?
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.