Sites to learn css:

Sololearn The Odin Project Reddit CSS Tricks CSS Help Pile CSS Basics Holy CSS Zeldman Eric Meyer: CSS Position is Everything HTML Dog Learn CSS Positioning in Ten Steps CSS Zen Garden CSS at MaxDesign CSS Discuss

Web Design from Scratch: CSS CSS on Delicious SitePoint CSS Reference CSS Dog

A List Apart CSS Topics

FREE Courses

https://www.youtube.com/watch?v=yfoY53QXEnI

freeCodeCamp.org

Build Few CSS Projects from here:

CodingNepal

Paid Course

Get Started With CSS (Plus Flexbox, Grid, and Sass)

Build Responsive Websites with HTML5 and CSS3

Practice CSS

CodeWell CSSBattle CoderByte CodePen Challanges Frontend Mentor Practity