I said that you could practice getting better at using skills using Warlocks and Shamans, because all three of their skills are active. You could ease into that using custom campaign settings to reduce the amount of units you need to manage (by increasing the cost to build new ones).
As I said, not all of the possible active skills are useful at the same time, and some skills are toggles.
- Spoils of War is for capturing buildings, it's not something to do in combat.
- For the Empire is a one-time toggle
- Chemical Warfare could probably do with an Autocast option
- Immunity could probably also do with an Autocast, but in the meantime, you generally cast that before the battle starts.
- Teleport is specialized, but when used to bring troops into a battle it's generally a fire and forget. Only using it to take troops out of a battle requires micro.
- Public Transportation is fire and forget
- You're mine is rather specialized and generally used before battle
- Besiege is a toggle
... etcetera
