tap

• Taps are formula and cask repositories
• The default tap is homebrew/core
• The simplest way to create your own formula is to create a GitHub repository called homebrew-<something>; put your formula file in it; then type brew tap <username>/<something>

# list repos
brew tap

# add repo
brew tap "user/repo" "https://github.com/user/homebrew-repo"
brew tap "homebrew/core"
brew tap "homebrew/services"