I am a big fan of Educative.io as I have realized I don’t learn concepts well through video, but I still need my hands on the keyboard while I am working through material to stay focused. The small quizzes also force me to pay close attention to key details and absorb better.

I find that video tutorials are better for learning ways to be efficient with tooling so random Youtube or conference videos work fine for me. Or even better, a remote pairing session with someone really strong in some particular tech!