Vim: Normal Mode

Shortcut	Description
r	Replace one character
R	Enter Replace mode
u / 3u	Undo changes 1 / 3 times
U	Undo changes on one line
J	Join with next line
<C-r> / 5 <C-r>	Redo changes 1 / 5 times

Useful links

• Create Online cheatsheet
• Vim Cheatsheet