I'm not sure if this is what you're looking for, but if you want advanced, you can go to Codepen and recreate some of the things there, then look at the code for answers.
This is an oft repeated suggestion. But the problem is that, there is very little step by step commentary on these codepens. Its mostly only the final step that is presented. I tried recreating some and then got stuck with finer points of positions, margin-auto etc. Thats when I realised I need to solve some advanced CSS puzzles. Thanks anyways!