Best AI for coding: learning to code, fixing errors and building apps faster
AI has changed how software is written. Beginners use it as a patient tutor; professionals use it to write, explain, test and fix code faster. But AI code can contain bugs and security holes, so you are still responsible for every line you ship.
The best AI tools for coding
| Tool | What it is | Best for |
|---|---|---|
| Chat assistants (Claude, ChatGPT, Gemini) | Ask questions in a chat | Learning, explaining errors, small scripts, planning a project |
| GitHub Copilot | Suggestions and chat inside VS Code and other editors | Everyday coding: autocomplete, explaining and editing code where you work |
| Cursor | A code editor built around AI | Editing many files at once with AI, asking questions about your whole project |
| Claude Code | An AI coding agent in your terminal and editor | Bigger tasks: reading a codebase, making multi-file changes, running tests |
| Replit | Online editor with an AI agent | Coding in the browser, even from a basic laptop; quick deploys |
| App builders (Lovable, Bolt, v0) | Describe an app; they generate it | Fast prototypes and landing pages; you still need to review and maintain the code |
Which is best? For learning: a chat assistant. For daily professional coding: an AI-enabled editor (Copilot or Cursor). For larger changes across a project: a coding agent such as Claude Code. Many developers use two: an editor assistant plus a chat assistant.
For beginners: use AI as a tutor, not a cheat
The fastest way to stay a beginner is to copy AI code you don't understand. Instead:
I'm learning Python. Explain what this code does line by line, in simple English.
Then give me a small exercise to practise the same idea, but don't show the answer.
[paste code]I got this error. Explain what it means and give me hints to fix it myself first.
Only show the full fix if I ask.
[paste error and code]Practise what you learn in this hub's free lessons and the live editor.
For working developers: a safe workflow
- Describe the task precisely: language, framework, versions, inputs, outputs, edge cases.
- Ask for a plan first for anything big, then the code in small steps.
- Read the code. If you can't explain it, don't ship it.
- Run it and test it, including bad inputs.
- Ask for a review: "Review this for bugs, security problems and edge cases."
- Commit in small pieces with Git so you can undo.
Ready prompts
Build a small feature
In PHP 8 with PDO (MySQL), write a function that saves a contact form (name, email, message) safely.
Use prepared statements, validate the email, limit lengths, and return clear error messages.
Explain any security choices.Explain an unfamiliar codebase
Here is a file from a project I've just joined. Summarise what it does, the main functions,
and anything that looks risky or outdated. [paste file]Write tests
Write unit tests for this function, including edge cases (empty input, very long input, wrong types). [paste]Security: what AI often gets wrong
| Risk | What to check |
|---|---|
| SQL injection | Always prepared statements / parameterised queries |
| Secrets in code | Never put API keys, M-Pesa passkeys or passwords in code or in prompts |
| Old or fake packages | Check the package really exists and is maintained before installing |
| Missing validation | Check inputs on the server, not only in the browser |
| Copying licences | Don't paste large chunks of others' code without checking the licence |
Think about it: An app builder generates a full online shop for a client in 10 minutes. The client wants to launch today. What should you check before going live?Show answer
Check that payments (M-Pesa/card) really work and are secure, that passwords and keys aren't exposed, that forms validate input on the server, that the site works on phones, that there are no placeholder texts or fake data, who hosts it and owns the code, and that you can maintain and fix it later. Test it yourself first.
Summary
- Chat assistants for learning; AI editors (GitHub Copilot, Cursor) for daily coding; agents (Claude Code) for bigger changes; app builders for prototypes.
- Beginners: ask for explanations and hints, not just answers.
- Always read, run, test and review AI code; you are responsible for it.
- Never paste secrets; check packages and security.
Check yourself
Should you ship code you can't explain? (yes or no)
Show answer
no
What should database queries always use to stop SQL injection? (two words: ___ statements)
Show answer
prepared
What should replace real API keys in prompts? (a ___)
Show answer
placeholder