Most Popular
chrome://settings/
chrome://bookmarks/
chrome://extensions/
chrome://apps/
chrome://downloads/
chrome://chrome
chrome://version/
A list of all of them:
chrome://chrome-urls/
And their uses:
https://www.ghacks.net/2012/09/04/list-of-chrome-urls-and-their-purpose/
External Links:
https://chrome.google.com/webstore/
https://www.howtogeek.com/189324/master-chrome-os-with-these-chromebook-keyboard-shortcuts/