1Inserting text

Enter insert mode:
i
In insert mode you can type and insert text as you are used to with most other text editors.

Insert text after current character:
a

2Exit insert mode and return to command mode

3Navigation

Move to the beginning of the document:
gg
Move to the end of the document:
G
Move to the top of the screen:
H
Move to the bottom of the screen:
B
Move to the middle of the screen:
M
Move one full screen forwards:
f
Move one full screen backwards:
b
Move one half screen forwards:
d
Move on half screen backwards:
u
Move to the beginning of the current line:
0
Move to the end of the current line:
$

4Text manipulation

Delete character forward:
x
Delete character backward:
X
Delete entire line of text:
dd
Delete n lines of text:
n dd
(n is any positive integer)
To change the current word:
cw
To change the current letter:
cl