Came here to post same.
https://every-layout.dev is a game-changer. The free content is a goldmine, and having spent $100 for the complete set of reated materials (book, component generator, etc) I can say I've gotten easily 10x that value out of it, maybe more. Hands-down the best CSS-related resource I've encountered since starting my career in web dev in 1998 (ie, before CSS was created).