A nicely documented pattern library.
Proving something that Derek Powazek told us 15 years ago:
When we clearly show what is and is not acceptable, the tone does change. People who want to share thoughtful comments start to feel that theirs are welcome, and people who want to spew hatred start to realize theirs are not.
D’hear that, Reddit?
Oh, Jesus Christ!
A great short talk from Clare about Code Club.