I'll try to explain them for you, in simpler terms. Basically, think of them as light switches. They can either be on, or off. Now, for an example use... Let's say you have an RPG map you're making, and you want a door that can only be unlocked if the player found the key. Basically, you'd have something like this:
Conditions:
Current Player brings at least 1 man to "Key Location"
Action:
Set "Key Switch"
Conditions:
Current Player brings at least 1 man to "Door Location"
"Key Switch" is Set.
Action:
(Your door actions (Special effects, messages, etc.))
Was that clear at all? Basically, you use switches to tell whether something happened or not, or whether something should happen or not. Granted, they have many uses, but you'll generally use them, as a novice, to check whether a certain event has occured yet. I hope that helps some, and that I didn't just confuse you more.
