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Choosing and configuring code-quality tooling per language — JavaScript/TypeScript, Python, Go, Rust — and migrating between tools.

What linters actually do and how to use them well — rules, severities, autofix, and keeping the signal without the noise.

Automatic code formatting: what formatters do that linters don't, ending style debates, and adopting a formatter without churn.

Tools that find bugs without running your code — how analysis works, what type checkers add, and where deeper analyzers earn their keep.

Enforcing code quality where it sticks: editor feedback, pre-commit hooks, CI gates, and keeping checks fast on large repos.