[Xenon]

hmm, it's specific in every game, but the general description:

level: the level of the person, mainly have to do with what the charakter could use as items. the higher the level, the "older and better" is the char

HP: hitpoints. the more hitpoints a char has then more hits he could accept until he dies

Exp: Experience, a value calculated on how much enemies a charakter has killed, and how much experienced he is in fighting, spelling and so on.
normally everytime a charakter got more than a specific ammount of experience, the level increases by one