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I have only played the game for a short time, about three months. I need information that isn't immediately obvious. For example, if you place a unit in a mine, the visibility around the mine will depend on the unit's visibility. Or, if you add a dragon to a hero with low speed, the overall speed will increase to the dragon's speed (if there are no other creatures in the army).
These are quite strange questions... and it's not easy to answer them. For one reason - I've never thought about it, let alone checked it. In reality, it's not that important.
The main thing is to know how to best develop a hero. To do this, you need to understand what each class gives.