Dungeons are a great way to strengthen your character in terms of experience and equipment. In early game you can get awesome amount of experience(especially when combined with your daily dungeon boost) as well as items needed to ugprade your gear. You can stock up to 6 dungeon charges and 6 great dungeon charges, you regain 1 charge per 8 hours. It's possible to get 4 extra charges for both dungeon types by using furnitures which have 23h cooldown and up to 2 charges by buying charges with bounty cards.