StackOverflow to becoming more welcoming. 👏
For me (cis het dude with monster-sized Asian tech privilege), learning to StackOverflow properly was certainly a learning experience, and I have the closed questions to prove it. I've also gotten enough useful feedback through it (and other StackExchanges, like GIS and statistics) that I try to give back by "mentoring" & showing how to improve the question.
Downvoting unhelpful comments is a great start. I see that too much.
Dr Vera Rubin's three basic assumptions, that I've verified (well, the first and last, I yield to the census people for the second):
1) There is no problem in science that can be solved by a man that cannot be solved by a woman.
2) Worldwide, half of all brains are in women.
3) We all need permission to do science, but, for reasons that are deeply ingrained in history, this permission is more often given to men than to women.