Looking for further resources to learn HTML/CSS/ etc

Finished the Responsive Web Design curriculum and I’m looking for other online resources, tutorials, curricula, etc. to further develop my skills/gain knowledge in HTML and CSS. I’m looking get into web design as a complete beginner and FCC gave me a good sense of the basics, I wonder if there’s anything else like FCC that can help me gain an advanced knowledge of responsive web design.

Build more projects. Duplicate site designs and when you experience any issues, Google them and then expand your knowledge. Going through tutorials won’t make a big difference unless you don’t face anything that challenges you!