To update all your gems
gem update --system
gem update
Bulma theme for Jekyll 3
https://chibicode.github.io/duo/
Reverie
https://www.amitmerchant.com/reverie/introducing-reverie-jekyll-theme/
So Simple
https://mmistakes.github.io/so-simple-theme/
Kiko-minus
https://areebk.gitlab.io/kiko-minus/
Minimal Mistakes
https://mmistakes.github.io/minimal-mistakes/
Grayscale
https://blackrockdigital.github.io/startbootstrap-grayscale/
heliumjk
https://andrewbanchich.gitlab.io/forty-jekyll-theme
https://gitlab.com/andrewbanchich/forty-jekyll-theme
Dark clean theme for jekyll
http://pavelmakhov.com/jekyll-clean-dark
http://docs.frontdeskanywhere.net/3_2_60_1/doc_designers_pdf.pdf
Spectral
https://github.com/arkadianriver/arkadianriver.com
Jekyll Academic theme
http://ncsu-libraries.github.io/jekyll-academic/
single-page jekyll theme
Dark theme for Jekyll
https://github.com/sharu725/dark-side
Naringu
https://github.com/ariestiyansyah/naringu
Feeling Responsive
https://phlow.github.io/feeling-responsive/
jekflix: A Jekyll template inspired by Netflix
https://github.com/thiagorossener/jekflix-template
Jasper 2
https://github.com/jekyller/jasper2
How to Create a Material Design Jekyll Theme
https://mademistakes.com/articles/using-jekyll-2016/
Generating a list of pages (not posts) in a given category
https://github.com/m-renaud/m-renaud.github.io/blob/master/_config.yml
Jekyll Documentation Theme
http://idratherbewriting.com/documentation-theme-jekyll/mydoc_pages.html
The Ultimate Guide to Static Websites with Jekyll
https://ines.io/blog/the-ultimate-guide-static-websites-jekyll
Introduction to layouts
https://learn.cloudcannon.com/jekyll/introduction-to-jekyll-layouts/
Add social sharing buttons to your Jekyll blog
https://vdaubry.github.io/2014/10/20/add-social-sharing-buttons-with-jekyll/
Hosting a Jekyll site on GitLab Pages
https://www.chenhuijing.com/blog/hosting-static-site-gitlab-pages/
Example Jekyll site using GitLab Pages
https://gitlab.com/pages/jekyll
Securing your GitLab Pages with TLS and Let's Encrypt
https://about.gitlab.com/2016/04/11/tutorial-securing-your-gitlab-pages-with-tls-and-letsencrypt/
Midnight Theme