Is there a code course/guide for No-Coders?

Hey!
Yesterday I was using a no-code tool that didn't have what I had in mind for a converting landing page. I wanted to built it thinking it would be easier to design something and learn HTML/CSS to implement it.

And I thought to myself what's the minimum amount of HTML/CSS, JS, API knowledge I should know to get the biggest Return as a No-(low)coder.