Pauline,
Absolutely normal. Spent thirty years trying to help people to understand motorcycles, cars, race circuits, skid pans and how to stay alive on the road. It takes time to sort out all the recent knowledge gained, so you have discovered what your coach or author meant. The basic problem is that the teacher knows what they meant, so they assume you must. Class situations are worse, as peer group pressure can prevent participants asking questions, in case they are thought to be obtuse. Coaches are coached to check by asking questions, watching your reactions and sometimes getting you to teach them.
You have just had a 'So that's what they meant' or 'I've managed it' moment. Well done.