Jekyll Themes with github pages

Hello User, how can i upload an use the Jekyll Themes with my Github account? https://jekyllrb.com/ http://jekyllthemes.org/ Did we have a tutorial? gimiller

I have read this solution: https://github.community/t5/GitHub-Pages/Jekyll-themes/m-p/14431 But i need more information, so far i have no experience with github and jekyll.