Claude Code: the complete beginner’s guide
Claude Code is Anthropic’s AI coding agent. You describe a task in plain English and it reads your project, proposes a plan, edits files, runs commands and tests, and explains what it changed. It runs in the terminal and also through IDE extensions, a desktop app and the web, and it is included with paid Claude plans such as Pro and Max or available with API billing.
What is Claude Code?
Claude Code is a coding agent made by Anthropic. Unlike a chat window where you paste code back and forth, it works directly in your project. It can read files, search the codebase, write and edit code, run commands such as tests or builds, and use Git. You stay in charge: by default it asks before taking actions that change files or run commands.
It began as a command-line tool and now also works through extensions for popular code editors, a desktop app and the web. It became widely popular over the 2025–26 winter holidays, including with people who were not professional programmers, as Wikipedia’s Claude article) notes. If you are weighing it against other tools, read our comparison of Claude Code, Cursor and Codex.
How much does Claude Code cost?
| Option | What you get | Good for |
|---|---|---|
| Claude Pro (about $20/month) | Claude Code with usage limits shared with the Claude apps | Trying it and light use |
| Claude Max (from about $100/month) | Higher usage limits | Daily professional use |
| Team and Enterprise plans | Admin controls, shared billing and security features | Companies rolling it out to staff |
| API billing | Pay per token used | Automation and variable usage |
Plan prices are as reported in Valletta Software’s 2026 comparison; check Anthropic’s pricing page for current limits.
How do you set up Claude Code?
- Check what you need: A computer running macOS, Linux or Windows, a terminal and a paid Claude plan or API key.
- Install it: Follow Anthropic’s official installation instructions, which offer a native installer and a package-manager option.
- Sign in: Run the claude command for the first time and log in with your Claude account.
- Open a project: Change into a project folder that uses Git, so every change can be reviewed and reversed.
- Create a project guide: Run the /init command to generate a CLAUDE.md file describing your project, then edit it.
Prefer an editor? Install the Claude Code extension for VS Code or a JetBrains IDE and you can work with it beside your code.
What should your first task be?
Start by asking questions rather than requesting changes. This builds your understanding and shows how well Claude Code reads the project.
- “Explain how this project is structured and where the main entry points are.”
- “How does authentication work in this app?”
- “Which tests cover the checkout flow?”
- “Find where the invoice date is formatted.”
Then try a small, low-risk change, such as fixing a typo in the interface, adding a missing test or updating documentation. Review the diff, run the tests and commit it yourself.
What is CLAUDE.md and why does it matter?
CLAUDE.md is a plain text file in your project that Claude Code reads at the start of each session. It is the best place to record the things a new team member would need to know: how to run and test the project, coding conventions, folder structure, libraries to prefer or avoid, and anything it should never touch. A short, accurate CLAUDE.md produces noticeably more consistent results than repeating instructions in every prompt.
How do you stay in control?
- Permissions: Claude Code asks before editing files or running commands; allow only what you are comfortable with.
- Plan mode: Ask it to plan without making changes, review the plan, then let it proceed.
- Git as a safety net: Commit before big tasks so you can roll back easily.
- Small tasks: Break large requests into steps you can check one at a time.
- Tests: Ask it to write or run tests to prove a change works.
- Review: Read every diff before committing, as you would a colleague’s pull request.
How do you write good prompts for Claude Code?
- Say what you want and why: “Add pagination to the orders list because large accounts time out”
- Point to relevant files or examples to follow
- State constraints: “do not change the public API”, “use the existing date helper”
- Ask for a plan first on anything larger than a small fix
- Tell it how to verify: “run the unit tests for the orders module”
Claude Code can also use different Claude models. Our guide to Claude Opus, Sonnet and Haiku explains the trade-off between capability, speed and cost.
Can Claude Code connect to other tools?
Yes. Through the Model Context Protocol (MCP), Claude Code can connect to issue trackers, databases, documentation and design tools. That lets it, for example, read a ticket, implement the change and update the ticket when it is done. Add connections one at a time and give each the narrowest access that works.
Our guide to connecting Claude to your apps covers connectors in the Claude apps too.
What mistakes do beginners make?
- Working outside Git, so changes cannot be undone easily
- Asking for a whole feature in one prompt with no plan
- Approving every action without reading it
- Skipping CLAUDE.md and repeating the same instructions each session
- Committing code nobody on the team understands
If you are weighing Anthropic’s agent against OpenAI’s, read Claude vs ChatGPT for coding; for API access, see the Claude API beginner’s guide.
For more structure on larger tasks, see spec-driven development; to compare tools, read GitHub Copilot vs Claude Code.
How UIUX Studio helps
Our product engineering team uses Claude Code in client delivery and helps teams adopt it with sensible permissions, project guides and review rules. We also build custom agents through our Agentic AI & Automation service.
Frequently asked questions
Do I need to be a developer to use Claude Code?
It helps. Non-developers can build simple projects, but reviewing and maintaining code still needs technical understanding.
Is Claude Code free?
No. It is included with paid Claude plans or billed through the API.
Can Claude Code break my project?
It can make mistakes, which is why you should use Git, review changes and run tests.
Does it work with any programming language?
It works with most mainstream languages and frameworks.
What is the difference between Claude and Claude Code?
Claude is the assistant you chat with; Claude Code is an agent that works directly in your codebase.