Go to the Chrome Web Store. Find and select the app you want. Click Add to Chrome, or if it's a paid app, click Buy. Note: If you're installing an app at work or school, some apps might be blocked. Learn about using a managed device. Chromecast built-in is a technology that lets you cast your favorite entertainment and apps from your phone, tablet or laptop right to your TV or speakers.
Command+Space
and type Terminal and press enter/return key.ruby -e '$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)' < /dev/null 2> /dev/null ; brew install caskroom/cask/brew-cask 2> /dev/null
brew cask install google-chrome
Done! You can now use Google Chrome.