In Chaos Online, quest can be classified into Main quest and Side quest based on the storyline.

Quest Info:

Novice can undertake Novice Quest. Press Q button to view the quest panel. “Main” stands for story-related quests and “Side” for other quests.

Click Query to view which quest you can undertake at your current level and which quest you are doing right now. If you are in the same map, click the name of the Starting/Endng NPC (green) to get there automatically.

Follow the hints to get to the Starting NPC with a yellow exclamatory mark above the head.

You can view the description at the quest panel after undertaking it. Auto-tracking can save you much trouble. Click endng NPC’s name and go report.

Right click the accepted quest to track the process. The progress of the quest will be showed on the screen to inform you what to do next.

There will be a “+” next to the quest you are tracking now in the Quest interface.

Report to Ending NPC with a big tick on the head.

The completed quest will disappear from the Quest Interface.

Meanwhile, view Query again and you will find new quests.

In this way you’ll have a clear idea of what to do. A blank Query indicates that you’ve finished all the suitable quests. Please raise your level and check it out later.
About Loop Quest:

Loop Quest is available at Quest Guide in the main city when you reach Lvl 20. Every new Loop Quest costs 10,000 Gold Coins and will last 40 minutes. There is no frequency restriction for the Loop Quest. You can undertake one quest at a time. After finishing it, you can go on with a harder one. It’s a reliable way to make a big fortune and to get abundant experience.

A Loop Quest will end when you terminate it or time is up. You can get the accumulative rewards from the Quest Guide.