This guide is meant to cover the basic user interface
Group Quest: Edit
Complete these to get extra cost to equip more/better gear. Also a great source of gold when you complete a stage for the first time.
The Main Story. Work on these whenever you can. Completion of all quests within a rank will give you access to the next rank in Main quests, sub quests, and events.
Your source of reforge materials. Current events such as boss fight and special gears are also found here.
Recommended Quest: Edit
These are dungeons being run by other players. The system will automatically join you to an open dungeon that is still on the first stage.
Friend Quests/Help Friends:
Quests that your friends are currently on, join them to go through dungeons with a familiar team.