F7

Check the spelling of the current document

Ctrl + F

Find and replace words

Ctrl + Z

Undo the last change

Ctrl + Y

Redo a change which you just undid

Ctrl + L

Align the current paragraph/selection to the left

Ctrl + E

Align the current paragraph/selection to the center of the document

Ctrl + R

Align the current paragraph/selection to the right

Ctrl + Shift + J

Show the current document full-screen