These little tips man, they are gold. Years ago I used to do a talk called "Cracking the Shell" that was just a bunch of stuff like this I'd picked up over the years. I know I'm not even scratching the surface. So many little tips and tricks.
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If you add this to your bashrc you can use vim key bindings to edit your commands.
set -o vi
Then if you write a command out and then press escape, you can use vim motions to move around and edit your command. Its mentioned in the post but not explained.
I find that useful.
ctrl-w
orcrtl-u
before. On mac, I usealt-right/left arrow
rather thanctrl-rl-arrow
to cursor over words.