I finally joined GitHub (and I have no idea what I'm doing)

So I did it. I finally made a GitHub account. My profile picture is my laptop camera photo and my bio says "aspiring developer" which I copied from someone else because I had no idea what to write.

I've been learning to code for about three months now. HTML, a little CSS, and I just started JavaScript. Everyone online keeps saying "just put your projects on GitHub!" — so here I am.

Except... I don't really understand what a repository is yet. I clicked "New repository" and it asked me a bunch of questions I didn't know the answers to. Public or private? Initialize with a README? Add a .gitignore? I just clicked things and hoped for the best.