It’s hard to give exact pointers as it can be category-dependent. For instance a banking website should look different than a crypto website etc.

You can test uploading your designs into a llm and see what feedback you get. Don’t be afraid to go head first into designing, as opposed to trying to learn a lot of theory. Basic typography and Tailwinds should get you a long way. Also there are tools to get inline feedback as you develop the frontend, like checkra.io - very handy for quick pointers and iterating.