Ask HN: How to learn web design in general

I’m a backend engineer with several years of experience. Although I don’t usually work with the frontend, I know HTML, I know CSS, I know JS. I know how to lookup some Tailwind docs, I am able to write a React app, I’m aware of CSS grids, flexboxes, etc. Sometimes I can even center a div without looking it up in search browsers.

But whenever I’m trying to design a page or a piece of a frontend app, my mind is a blank page. I don’t have a clue on how to organise space for the data, how to position the text and images, how should the static page look like on mobile, what colors to use and which font families to choose from.

What would you recommend for learning web design itself? Particular books, courses, projects? Looking at other websites and analysing them on paper? I would gladly put some hours into this if I knew it’s going to pay off. Were you in such position yourselves? What worked for you?