I buy physical copies of two books for each language I work with: - The <Language> Language book - Effective <Language> book, if I actually start using the lan

I buy physical copies of two books for each language I work with: - The <Language> Language book - Effective <Language> book, if I actually start using the language professionally For example, for JavaScript, this was "Eloquent JavaScript" and "JavaScript: the good parts". I find that the "The <Language> Language" books are of exceptional quality and have a very long shelf-life. They go in depth into the design of the language, decisions made, and provide high-quality, idiomatic code examples that you just cannot reliably find on the internet. You cannot know what good Java/Python/Ruby/Rust code looks like while you're learning the language.