You can take any course you want in any order. If you're already familiar with CSS and don't think you need to learn more, simply don't watch the CSS videos.
These courses are designed with you in mind. Watch a video, practice some code. Watch another video, practice some more code. These courses are a blend of videos (theory) and real life practice. I've thrown in some projects for you to get some hands on, real-life, experience, too.