Practical Vim

Vim Tip 13 - corrections

keystrokes effect
<c-h> backspace
<c-w> delete back one word
<c-u> delete back to start of line

⭐ Vim Tip 14 - insert normal mode

When in Insert mode and you press <C-o> you enter in the Insert Normal mode. It's a special version of normal mode where you're allowed to execute one command and then go back to Insert mode.

For more info see :help i_CTRL-O.

Vim Tip 15 - paste from register

While in insert mode, you can paste from register with <C-r>{register}.

It's also mentioned that <C-r><C-p>{register} would be smarter, but in my quick tests I didn't see any difference.