To gain new skills in POE Currency , you'll usually need to equip stone into sockets in your gear. Any course can use any ability, but gems do have stat and degree demands. Stone can only be equipped in slots of the same colour.
Skill gems: These include an attack, charm, projectile, or trap/mine. Support stones: All these gems modify supportable abilities when equipped in a linked socket (one with a line drawn to some other socket). The service gem must be compatible with all the gem in the linked socket in order to get an effect. For instance, a service gem that affects projectiles won't do anything to some connected melee attack stone. Ensure that your linked gems are compatible!
Equipped gems level up as you make XP, getting ten percent of the base XP granted from monster kills. Your personality encounters an XP penalty when revisiting lower level regions, but that penalty doesn't apply to gems. So you can quickly level gems by replaying areas that are a few degrees lower than your existing degree.
POE Trade Currency players generally concentrate on the current challenge league.