Are you still starting your projects with a blank page? Don't do that!
FCC: Responsive Web Design Certificate. This site is great for mastering the basics of HTML & CSS + design. The exercises are clear and helpful, plus there is a great online community so there are many helpful posts and videos for each exercise. (PS. the Applied Accessiblity exercises are assigned for homework by the end of this module!)
The Odin Project: HTML5 & CSS 3. This is another great open source course that will help give some structure to your independent study. TOP is more project-oriented and pulls together resource from all over the internet to help set your study path.
Both are great options, take a look at each and follow the one that helps you the most!
HTML Crash Course for Absolute Beginners(Traversy)