Hey everyone, I worked through the first three projects of “Responsive Web Design” and felt like I was using CSS mostly by trial and error. I started going through this book and it’s been a huge help to start understanding the “why” behind how everything in CSS fits together. It also has a good overview of Flexbox/Grid and how they can work together.
Here’s the link. The publisher has made the entire book available to view for free online.
Hope it’s helpful to someone.