Claude Code: Complete Guide from Zero to Professional

The tool installs for free, but you need a paid account to use it. There are two paths: a Claude subscription (Pro, Max, Teams, or Enterprise) or an API account through the Anthropic console. With a subscription you pay a fixed monthly price with usage limits included. With the API you pay per token consumed. Most individual users start with Pro — it's the simplest way to get going. Teams usually go with Teams or Enterprise. The free Claude plan does not include access to Claude Code.

Installation takes under five minutes. On macOS or Linux, run curl -fsSL https://claude.ai/install.sh | bash in your terminal. On macOS you can also use brew install --cask claude-code. On Windows, use PowerShell: irm https://claude.ai/install.ps1 | iex. Once installed, navigate to your project directory and run claude. The first time it will ask you to authenticate with your Claude account or API key. No additional setup needed to get started. There's also a VS Code extension, a JetBrains plugin, and a desktop app if you'd rather not work in the terminal.

They're not competitors — they're complementary tools. Cursor is an IDE (VS Code fork) with integrated AI: inline completions, visual diffs, multi-model support. Claude Code is a terminal agent that reads your codebase, runs commands, and carries out complex tasks autonomously. Cursor is more comfortable for quick edits and code navigation. Claude Code is more efficient for multi-file refactors, spec-driven implementations, and long-running autonomous tasks. I use both every day — one for the heavy lifting, one for the everyday. My recommendation if you're starting out: try both, the combined investment is reasonable, and you get the best of both worlds.

Yes. It's designed for developers. It operates in a terminal, reads and writes code files, runs shell commands, and assumes you understand what it's doing. Reviewing its output is the most important part of using it well — and that requires technical judgment. If you're a junior developer, it can be genuinely educational: ask it to explain what it's doing as it goes and you'll pick up patterns faster than any tutorial. But the tool doesn't replace programming knowledge — it multiplies it. If you want to automate tasks without touching code, there are better-suited options.

Yes. Claude is fully multilingual and handles non-English languages without issues. You can write prompts in your language, get responses back in your language, and Claude will correctly understand context and technical terminology. I use it in both English and Spanish depending on the project. For code tasks, English produces slightly more natural output since most programming documentation is in English — but for explanations, conversations, and non-code tasks, other languages work just as well. You can mix languages within a session. If you want Claude to always respond in a specific language, add that to your CLAUDE.md.

It exclusively uses Anthropic's Claude models — you can't connect GPT, Gemini, or any other provider (unlike Cursor, which is multi-model). By default it works with the latest version of Claude Sonnet, which balances speed and capability for programming tasks. You can switch to Claude Opus when you need more power — architectural decisions, complex debugging, deep reasoning — at the cost of higher token consumption. Claude Haiku is also available for lightweight, fast tasks. The model can be configured per session or in your environment. My recommendation: Sonnet for daily work, Opus when the task justifies it.

Yes, and it handles large projects better than most alternatives. It intelligently reads only the relevant parts of your codebase for each task — it doesn't load everything into memory. The key is a solid CLAUDE.md that tells it which parts of the project are relevant for different task types and which directories to avoid. I use it on projects with hundreds of files without issues. What scales with project size isn't difficulty but token consumption: more context means higher cost per session. Using hooks to enforce focused sessions keeps consumption under control.

It depends on how you use it. With a Claude subscription (Pro, Max, Teams) you pay a fixed monthly price that includes usage within certain limits. With the Anthropic API you pay per token consumed — no fixed price, you scale with usage. The actual cost varies with intensity: session length, codebase size, and which model you use. The best way to estimate your cost is to run a few real sessions on a project and review your consumption. Check Anthropic's pricing page for current rates.