# Insertion
a - enters insertion mode, append after the cursor.
A - enters insertion mode, at the end of the line.
i - enters insertion mode, insert before the cursor.
I - enters insertion mode, at the beginning of the line.
o - enters insertion mode, creating a new line under the cursor.
O - enters insertion mode, creating a mew line above the cursor.
C - enters insertion mode, cut the end of the line.

# File management
:w - writes (saves) file
:x - writes (saves) file ans exit
:q - quits
:q! - quits without saving changes