Having more examples, more recipes, not just general concepts and lots of theory. I really value web documentation that let you play with a playground code, or that highlights some famous recipes to do a specific thing.
My motto is : learn by examples. I like Idriss Aberkane saying that "animals have chosen playing the top tool to survive. Your cat play, the tiger in the jungle play, the dolphins play. This is the best way to learn. Animals are not born with skills, they learn it, so do we, and mistakes are the best indicator of progression." (not quoted exactly as is, but more or less the idea!).
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