Skill gems: These include an attack, charm, projectile, or trap/mine. Support gems: These gems modify supportable skills when equipped in a connected socket (one with a line drawn to another socket). The service gem has to be compatible with the stone at the connected socket so as to get an effect. For instance, a service gem that affects projectiles won't do anything to some connected melee attack stone. Make sure your linked jewels are compatible!
Equipped gems level up as you make XP, getting ten percent of
PoE currency their foundation XP awarded from monster kills. Your personality experiences an XP penalty when revisiting lower level regions, but that penalty doesn't apply to stone. Thus you can quickly level gems by replaying areas which are a few levels lower than your current level.
Do not pick up every single piece of loot you find
Every part of loot you get takes up varying amounts of room in
PoE trade currency your luggage compartment. To carry as many possible things at once, you have to move things around and squeeze items into the allotted spaces. Even after that, your bag is likely to fill up fast if you pick up each and every thing you encounter.
The trick, then, is to ignore items that your character can't use or are of low price. Item rarity is indicated by colors: White: Norma,Blue: Magic,Yellow: Rare, Orange: Particular.