bundle exec jekyll serve
jekyll build
sudo gem install bundler sudo gem install -n /usr/local/bin/ jekyll rm Gemfile.lock
https://jekyllrb.com/docs/usage/
https://help.github.com/en/articles/adding-a-jekyll-theme-to-your-github-pages-site
my bolg
bundle exec jekyll serve
jekyll build
sudo gem install bundler sudo gem install -n /usr/local/bin/ jekyll rm Gemfile.lock
https://jekyllrb.com/docs/usage/
https://help.github.com/en/articles/adding-a-jekyll-theme-to-your-github-pages-site