Q:

Fastest way to print a blank line?

How can I print a blank line at some line with one pressing while not in the insert mode?And after that I should still be in normal mode.

A:

In vanilla vim it is o<ESC>. It is 2 keys to press.
You can also add the following in your .vimrc:
noremap <CR> o<ESC>

to speed up blank line creation with just one single Enter :).

