[undulation]

This would be a small supplement to actually building some basic projects out, but one thing that I've found helpful in the past and continue to find helpful is to play around with modifying the CSS and html within chrome's devtools. It's a great way to see how certain properties in CSS affect their respective elements in real time without wiring up project files and development environment. This little guide is a good start: https://developers.google.com/web/tools/chrome-devtools/css/