Start with one tool and learn it well. Here's how to choose:
If you're new to AI coding, use Cursor. It's a VS Code fork, so the interface is familiar. The free tier is enough for learning, and you get multi-file editing with Composer.
If you prefer terminals and work with large codebases, try Claude Code. Its token context window handles bigger projects.
For quick prototypes, use v0 or Bolt. They generate full apps from descriptions in minutes.