
As per the unclutters:
"How much time are you wasting by not using keyboard shortcuts? Take the time to learn, practice, and use keyboard commands to improve your productivity."
Click the links below to increase your productivity and free yourself from your mouse.
For Windows
For Mac
One of my favorite shortcut ever is ALT+TAB.
This shortcut allow you to switch between open programs.
If you don't have time to learn something new you need to F1 yourself.
For more: Increase your productivity with keyboard shortcuts [Unclutterer.com]