Over the years I have found many shortcuts that help me code making it a lot quicker.
I just found out a shortcut today, hence the reason why I wanted to make this post!
the one I found out today is
if you hold holding command/ctrl + shift + up/down NEXT TO A NUMBER
I will change the number
NOTE: it will only add or subtract by 1 so if you want to get to 3 form 1 you click up 2x
my favorite shortcut is the multiple cursor short cut
you can do this by holding command/ctrl + clicking where you want the cursor to go
to undo the multiple cursors just click anywhere else and it will revert back to a single cursor.