brew update && brew upgrade ruby-build
brew install rbenv
Add eval "$(rbenv init -)" to the end of ~/.zshrc or ~/.bash_profile
rbenv install 2.7.0
rbenv rehash
rbenv global 2.7.0
gem install bundler jekyll
bundle install
bundle exec jekyll serve
git checkout master
[make changes]
git add .
git commit -m "add ..."
git push origin master