Ctrl + Shift + End = marks the text up to the last line

Shift + F3 = changes the case of the selected text (from UPPERCASE to lowercase)

Ctrl + Enter = inserts a page break
Shift + Enter = inserts a line break

Ctrl + Home = jumps to the first line
Ctrl + End = jumps to the last line

Shift + F5 = jumps to the last edited text (even after Word is restarted); pressed again, it will move between the last five edited bits of text

Hope you'll have an easier life using them! They have helped me a lot!