Describes the cause and action for error messages.
Error Message(English)：
pages not jekyll
GitHub PagesにJekyllを使っていい感じのページを作る例 - Qiita
https://qiita.com/stkdev/items/0e2df27736acbea9bd26
ローカル上のJekyllサイトを GitHub Pages で公開する方法（単純に静的 ...
http://marbles.hatenablog.com/entry/2019/01/16/221417
Site not building on GitHub pages ・ Issue #67 ・ mmistakes/skinny ...
https://github.com/mmistakes/skinny-bones-jekyll/issues/67
Setting up your GitHub Pages site locally with Jekyll - GitHub Help
https://help.github.com/en/articles/setting-up-your-github-pages-site-locally-with-jekyll
Troubleshooting GitHub Pages builds - GitHub Help
https://help.github.com/en/articles/troubleshooting-github-pages-builds
Using Jekyll as a static site generator with GitHub Pages - GitHub Help
https://help.github.com/en/articles/using-jekyll-as-a-static-site-generator-with-github-pages
Jekyll on Github Pages not rendering CSS - Stack Overflow
https://stackoverflow.com/questions/33634520/jekyll-on-github-pages-not-rendering-css
Bypassing Jekyll on GitHub Pages - The GitHub Blog
https://github.blog/2009-12-29-bypassing-jekyll-on-github-pages/
GitHub Pages | Jekyll ? Simple, blog-aware, static sites
https://jekyllrb.com/docs/github-pages/