Books and materials on CSS?

Question

css

Hello.
I do, but I want to know more.
And on the Internet, mostly "for beginners", is there something that will pump the skill?
UPD.
Resources middle and higher are needed.

Answer 1

W3C specifications.
Yes, it's boring. But you can only get a complete picture of Caruso at a live concert of Caruso, and not from Rabinovich on the phone.

Answer 2

https://www.w3schools.com/css/
https://css-tricks.com
https://www.smashingmagazine.com/category/css