The classics are all covered in other comments. For some hyper-relevant content (the sand to fill the in-between spaces filled up by big philosophies and princi

The classics are all covered in other comments. For some hyper-relevant content (the sand to fill the in-between spaces filled up by big philosophies and principles), I've found Will Larson's blog (https://lethain.com/ https://lethain.com/) and book (https://press.stripe.com/#an-elegant-puzzle https://press.stripe.com/#an-elegant-puzzle) to be really useful. It provides tools for solving specific problems, and a language to discuss what's going wrong and what the solution looks like. https://lethain.com/durably-excellent-teams/ https://lethain.com/durably-excellent-teams/ The concepts he covers in this post, in particular, have been invaluable.