Mac
These are general keyboard shortcuts for most versions of OS. Many of them also work with Windows by substituting the Windows button for the Command button.
1. Undo and Redo — Command+z and Command+y
2. Screen Capture — Command+Shift+3 (captures to a file); Command+Shift+Control+3 (captures to clipboard). To capture a selection substitute 4 for 3.
3. Move down a web page — Space Bar
4. Jump to the top or bottom of a web page — Command+Up/Down Arrow
5. Move to the most recently used open application — Command+Tab
Also Enjoy: Back to Basics: How to Make a Website
