This is a combination of ‘classic’ writings that are often referenced by designers, and some good practical advise by good designers, some of whom I’m lucky to call friends.
Recruiting a Designer? Here’s What You Should Know by @lominming
Don’t know what’s the difference between a UX and visual designer? This is a useful primer on the different design roles in the tech industry
Also check out my answers to some design topics on Quora: