Doing a lot of typing? Want to make your life easier? Read (and perhaps print-out) this list of great keyboard shortcuts
CTRL-C Copy the selected text
CTRL-V Paste the selected text, BUT note these cautions to pasting
CTRL-X Cut the selected text
CTRL-A Select everything on the page
CTRL-Z Undo - this is often handy, but only goes one step back
CTRL-B Bold
CTRL-U Underline
CTRL-I Italics
Enter - New Paragraph
SHIFT + Enter - Linebreak / New line
Mac computers are much the same, except you press the Apple key instead of Ctrl.
Typically any keyboard shortcut you are familiar with will probably work.
Note, CTRL-S does not save. You need to click the Save Changes button.