There're hundreds of quests in SOL of 3 types:
Letter Delivery: Trying to take a letter from one NPC to another NPC to get the reward
Discover and Retrieve: Trying to find and get back something at some place
Challenge: Trying to beat the monster to get the reward.

Through quests, gamers could not only deep the understanding of the game, but also get all kinds of rewards, including experience points and gold.

When you find a NPC with a golden exclamatory mark hovering over his head, you can receive a quest from him just by clicking on him to start a dialogue.

Read the quest description carefully, making sure what you're expected to do.

fter accepting the quest, you could check your quest status and relevant information anytime by pressing the shortcut key L.

Go to the prearranged NPC to hand in your quest when mission's done, normally he is distinguished through a question mark above the head.