There are 18 skills in FOnline. At the beginning of the game you have to choose your 3 major skills. The skills you want to pick depends on who you want to become (Warrior, Crafter, Doctor, Wanderer, e.t.c.). The percentage of the skill shows how good you are at that skill. Each level you will gain some Skill Points. You can spend this points to increase one or several of your skills. Note that you can increase major skill twice faster than others (2% instead of 1%).