if you want to learn how to design websites, start by copying websites you like. find something similar and recreate the UI. eventually you will figure out the patterns and start creating your own design. that's how it works.

if you still feel like you need study material, have a look at Refactoring UI. it's a book about design for developers, by the creators of tailwind Ui.

if you don't really care about design and you just want to build stuff that look good, buy tailwind ui since you already mentioned it.