good work Tobster
Tobster it is pleasing to read that you seek to improve your knowledge of how to be a safe pilot.
Whether you 'should already know it' is immaterial. Shrug off the critical responses that follow this line.
The training system is always going to spew out a few people like you and me whose grasp of the syllabus is less than perfect.
For myself, I learned lots by questioning experienced pilots as and when I felt the need and luckily I got cooperative answers; to the extent that I was able to hold professional flying licences for around thirty years.
So just keep on asking when you need to.