Blue color skills are pve and red color skils are pvp and green buffs tell me if i wrong :)

Blue are energy skills.
Red are physical skills.
Green are buffs.
Yellow/Brown are buffs/heal skills & similar...
Purple are debuffs.

Green letters in a skill - using e.att/energy attack only.
Yellow letters in a skill - using p.att & e.att also known as state damage.
Orange letters in a skill - using p.att only.