JIT Learning. Just in time Learning. You Don't need read a book from cover to cover. YAGNI. Many technical books talk about topics that you might never need in your career. Focus on what you need to know after making a plan for what you want to achieve.

YAGNI applies to coding as well. Don't create a class or a method just because you Might need it later. Create them only when necessary. This keeps your code cleaner and there is less to test.