This habit is critical. Every day when you drive, you must toot your horn to build that brain-body connection. In your future driving, when anything gets close, you will toot your horn without hesitation.
This is important.
When teaching, several times a month, I prevent a collision by merely reaching over and tooting the horn.
LEARN TO TOOT YOUR HORN WITHOUT HESITATION.
IT’S THE WAY!
and should definitely be a big part of driver education