Is there a way to make a keyboard shortcut for Save on the node edit page? It would save a lot of time not having to scroll to the bottom of the page to save edits to a node.

Are there modules which achieve this?
Keyboard Shortcut module might be the one you are looking for , Project page says


  The Keyboard Shortcut Utility module enables you to create keyboard
  shortcuts on your website. You can create a shortcut to go to a page
  (internal or external) or call a JavaScript function.