Which language is the best to build an Operating System?

Question

I want to build my own OS but don't know where to start.

Answer 1

First of all, find what is the role of an operating system, and how it works : what are his different parts,...
Then, try to implement this different parts, to make sure you'll know hot to do.

You will need to learn assembly, C language (or Rust).

A very important thing : you'll never build alone a GUI for your OS. If you can handle multiple processes, have a shell and handle file manipulation, it's great.