Vi Quick Reference - RobotGirls/FTC-Team-25 GitHub Wiki

Command Description
i insert text before cursor
a insert text after cursor
I insert text at beginning of current line
A insert text after end of current line
o open a line below current line and insert text
O open a line above current line and insert text
'r' replace one character
u undo last command
ESC to switch back to command mode from insert mode