I have 2 questions about web dev and mern stack

I don't know how to design UI of a website and make it beatiful everything I design is a simple ugly UI, what do you suggest for me? a course or something else
And seconde question is this I can code in react, node, express, mongoose, tailwind but I can't create website when I want to start a project I don't know what should I do, I stuck completely
HELP ME PLEASE !!!