Any tips to get better at CSS or resource you would recommend?
2. CSSTricks
3. Learn to read MDN docs.
4. Flexbox froggy and grid garden
5. Hyperplexed (older videos)
I warn you, that "studying" CSS is a pointless endeavor. Your knowledge should be "tools that exist" without knowing the exact syntax.
Also, "No JS". Make your stuff without JavaScript. It forces you to use every quirck in HTML and CSS to make stuff work.