Jumping from cards using the default shortcut is really weird for me. I have to take my hand off my mouse to be able to do it. Would prefer a shortcut my left hand could easily do. I'd personally prefer something like 'shift+a or z' to toggle between apps :)
Open a new card, close and restore closed card with Command + T, Command + W and Command + Option + W shortcuts
go back and forward with mouse side-buttons 3/4
in regular browsers, the side mouse button 3 will go forward a page (if applicable) and mouse button 4 will reverse back to the previous page you were on, making it easier to navigate back and forth through pages.
Logitech Mouse back/forward
Use the mouse back and forward to go back to the previous page or forward.