The correct answers to these open questions are the following.
What stage or step did you find most interesting?
The stage I found more interesting was stage 3, the fermentation, because Reinhart says it is when the flavor develops. It is the stage when the yeast combines with the sugar to develop the flavor of the bread.
Did you have any knowledge about the massive amount of prep and procedure that goes into making bread?
No, I didn't, but I was very impressed after listening to Reinhart in his Ted talk. I really like when he said that "flavor" was the most important thing when making bread. For him, the flavor was the key element and the most essential.
From now on, my full respect for bakers.