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You can see all the skills that your character can learn and their levels in the Skills window. You can open and close the window by pressing Ctrl + K. Clicking on each skill displays a detailed description, the required experience points, the level required to learn the skill, etc.
The Slayers
The Slayers gain levels as they become more proficient in the weapon they wield and use. Using the applicable skill also raises the domain level, and when a certain level has been attained, a new skill can be learned. As the skill proficiency (skill points gained through using weapons) increases, the next tier of skills can be learned.

You can learn new skills by talking to the skills trainer NPC on the 3rd floor of each guild building. To use the learned skills, open the Skills window (Ctrl + S), click the skill you wish to use, and then use the skill by right-clicking.

The total sum of the Slayers skill domains is 100. Once you reach level 100 on a skill, you gain the Master title. When the domains reach the total of 100, the highest domain level aside from the applicable domain gets reduced. Therefore, plan ahead how you will develop your character and gain proficiency in one class of skills right from the start.

There are the following domains according to the weapons class.
Sword Class Sword
Blade Class Blade
Gun/Bomb Class Gun/Bomb
Healing Class Heal
Enchantment Class Enchant
Vampires
Vampires can learn new skills as they gain more experience points. When they reach a certain level, they can talk to a skills trainer NPC to learn new skills.
Innate Class Innate
Acid Class Acid
Blood Class Blood
Curse Class Curse
Poison Class Poison
The Ousters
The Ousters can freely learn new skills with Skill Points obtained as experience point increases. They can teach themselves new skills in the Skills window. Skill points which you are given when you gain a new level can be spent to learn a new skill or improve previously learned skills, making it more powerful.
Combat Class Combat
Fire Class Fire
Water Class Water
Earth Class Earth
Wind Class Wind
Ousters Skill Tree
The Ousters Skill Description Window
Once you have learned some skills, you can confirm the acquired skills in the Skills window (Ctrl + S). To use a skill, click the icon of the skill you wish to use, mouse over a player of another race, then right-click to attack. You can attack a player of the same race as well by pressing Shift while clicking, but you will be subjected to alignment penalties. (You can find more information on alignment penalties on the System menu.)

You can assign your skills to function keys and use them with ease. The Slayers can assign skills on F9 – F12, vampires on F5 – F12. and the Ousters on F7 – F12. To assign skills, open the Skills window by pressing Ctrl + S, then mouse over the applicable skill and press the function key.

When using skill, the Slayers consume MP, vampires HP. and the Ousters EP. Skills displayed in light blue in the Skill In Use window is a passive skill which maintains its effect without being separately activated. If the character does not have the required amount of MP, HP, or EP for the skill, the skill will not be activated.