Jekyll 3.9.0 with GitHub Pages - Theme

Hello Users,

did you know a good working tutorial to use GitHub Pages with Jekyll 3.9.0?

My system

jekyll -v
jekyll 3.9.0

git --version
git version 2.30.2

ruby -v
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x86_64-linux-gnu]

https://jekyllrb.com/docs/troubleshooting/#no-sudo

I want to create a Jekyll page on GiHub.

https://drjekyllthemes.github.io/

https://rubygems.org/search?query=jekyll+theme

Which Free theme should be working with my system?

Thank you

steveng