Some vim tips

Incrementing numbers
C-a

and

C-x

  increments/decrements the next number.

:help CTRL-a

shows how to macro a numbered list. r/vim points out that your cursor can be before the number and 

C-a

 will still increment it. Similarly, your cursor can be before the quotes for

ci"

 to edit it. This works with

da{

, etc.

Scrolling
C-d

/

C-u

scroll by default by half the screen, but can be customized like

7C-u

to scroll 7 lines at once. In my opinion, scrolling with 

1C-d

 is superior to holding down

j

 because it allow me to scroll while my cursor remains centered in the middle of the screen, so I know where I’m going and don’t need to

zz

after scrolling.

Fixing typos

If you make a typo in insert mode, 

C-w

 deletes the previous word, so you can keep typing as if nothing ever happened.