Combat

You can start combat by clicking on any monster, which will bring up the combat screen.

At the top, you'll see information about yourself and your team. On the right side, you'll find details about your opponents (monsters).

To position your team, simply click on a team member, then click where you'd like them to stand when combat begins.

You can also adjust the combat speed (1x, 2x, 4x, 8x). Higher speeds will unlock as your level increases.

Damage

Dealing damage to opponent is the key to do the combat
Attack power came from:
Your attributes, Current equipments, Skills, Event/Special effects

Defense

Your Attack power will be reduced by opponent's defense, which came from attributes, equipments and skills