I do a lot of front-end development these days, but I still feel that my CSS skills are weak. CSS is (for whatever reason) hard for me. Does anybody have any

I do a lot of front-end development these days, but I still feel that my CSS skills are weak. CSS is (for whatever reason) hard for me. Does anybody have any CSS learning resources that have exercises? There's plenty of books out there, but I really need a guided, hands-on learning experience.