In general, quests are related to your system and the system will provide you with only those quests through which you can improve in the aspects related to your system. A warrior system will give combat related quests, or a blacksmith will be given creation related quests. Though at certain times, you may end up getting a quest not related to your system, but related to your work and other things. For example, you work in a school, but even if your system isn't teaching related, sometimes you might get a quest related to teaching or something.
Also, during emergencies there are quests given such as escaping, surviving, or fighting that are more of a self-sustaining quest that motivates you to survive and not die.
