UD3: Module 69 through Module 79.
Today it really hit me that Stephen Grider (UD3) is great at breaking down the code and explaining things.
For example, I loved how he explained the difference between Mapping and Structs. He basically said that you would use Structs when you want to represent a singular thing (i.e. a car, a house, a desk, etc.). And you would use Mapping, to store a collection of things (i.e. a collection of cars, a collection of houses, etc.)
At any rate, I don’t think I would have been able to fully appreciate his impressive teaching style, if I hadn’t experienced at least three other Solidity instructors. And while the other instructors are good, I just feel that Grider is on another level.