For reference, here are thought bubbles:
The o O tail gives it away as a thought.
This is how I finally started learning grammar after failing at following grammar books for more years than I’d care to admit.
My recommendations for when you see such a detailed breakdown:
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Be sure to read it all. (This applies more so to book clubs where there can be a lot of grammar discussion going on, and different people may explain the same concepts in different ways.)
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Don’t worry if you don’t understand it all right away.
I believe the most important thing is to be exposed to the concepts (such as in grammar). You’re going to see them over and over again as you continue reading, so the sooner you learn of them, the more chances you’ll have to recognize them again later. And that makes it easier to grasp the grammar when you read about it again later to better understand it.