Emphasis on reading. In my experience writing good code or effecient writing/debugging of code only came after: 1. Learning to read the project code i.e. understanding idioms, structures, execution paths, project syntax+language 2. Learning to extrapolate i.e. anticipating answers or making good guesses for inevitable questions during code writing. Questions like where/when should I do this or where/when is this info I need actually available

Both those things literally only came after reading so much code! No shortcuts from the Dev environment (idea, docs) aside from navigation and search!