Skill point

In Guild Wars Skill points are used to train skills from skill trainers. When you learn a skill from a skill trainer, one skill point will be substracted from your character.

Aquiring skill points
You can gain skill points currently by two ways. First of them is by doing missions. Completing the primary goal of a mission will award you a skill point. The second way is by filling your expirience bar and either gaining a level and a skill point, or, once you reach level 20, just a skill point.When you have collected the required amount of expirience, the experience bar will be emptied and you will be awarded a skill point. You can see your current skill points from the upper part of the Hero Screen.

Tips
Many players try to use skill points sparingly and get every skill that is possible to get from doing quests by doing quests. By that way you do not waste any skill points for getting a skill.