7 habits for effective text editing

This morning I watched the lecture of Bram Moolenaar, the creator of
VIM. Its title is "7 Habits For Effective Text Editing". I can
understand a little of it. But I learned a method of auto completion.
I can use "CTRL-N" for it. Vim is a treasury. You can pick a tool and
use it easily. There is the movie at youtube too. See below.