From Black Desert Wiki
Black Desert combat is fast-pace and action packed. The game uses mostly unassisted targeting.
Players can block, avoid, hold, and kick for their basic attacks. In order to block and avoid attacks, these actions must be done in a timely manner. Enemies can also block and avoid your attacks.
Each player will have a set of skills at their disposal, depending on what class they are using. These advance skills can be used in conjunction with your basic actions. Some skills will require the use of magic points and certain weapons and equipment.
Players can also fight on their mounts. They can fire guns, and a bow and arrow atop their mounts. As well as use melee weapons. Horses can also back kick.