I am just getting into chess so the quizzes and lessons are kind of essential. I’d like to get really good at chess. Chess.com was fun until I ran out of free things, but Lichess is open source, free, and fabulous.
Not to double post about chess but if you’re going to kill time on your phone, it feels so much more dignified to open the chess app rather than one of the usual suspects (pi.fyi excluded). Good conversation starter too.