Can’t help you on your missing link I’m afraid.
You don’t need a study guide for the Rules.
You need your own copy of the Rules that you can carry around with you all the time that you are at sea.
And when you aren’t at sea.
And then you can pick it up at any time and read, learn and inwardly digest it.
Kind of like learning your times table off by heart, one day it all just clicks.
Then you get to learn how to apply it all!
I mean, it is considerably smaller than the Bible, The Koran, the Talmud (that might be a recipe, not sure) and whatever the Jedi had for bedtime reading.
Use a pencil and paper and draw your own vector diagrams; amazingly helpful.
And remember, Mark 1 Eyeball, always the most reliable instrument that you have at your disposal.
Look out the frigging window!
Obviously somewhat difficult if you are on a submarine (see other thread about that).