How to get deep knowledge in 3D sculpting? (3.js etc.)

I'm building a little tool to sculpt car bodykit parts in a low poly style. I am trying to build a fun and simple abstraction over 3d sculpting. Imagine minecraft had a sculpting ability where you can hit metal with various tools to shape them.

I've done a course on 3.js and I've come across SculptGL. I've made some minor progress [0] carving out a subset of SculptGL.

[0] https://imgur.com/a/f3W23aX

I'm basically trying to remake https://johanpeitz.itch.io/picocad.