Hi Mark,
I have previously gone through the course 😉
All the lectures about Bendy Bones have ‘Bendy Bones’ in the title.
There are also 2 exercises that utilise this feature. That is the Bendy-Squashy Rig, and the Bouncing Ball Rig.
This course doesn’t cover what you can and can’t use in different game engines, but I would suggest you check out CGDive’s YouTube Channel as Tudor (the author) has a series on that specific topic.