Abilities of Teemo
Spell skill priority is an important winning factor for Teemo. Understanding the abilities of Teemo in League of Legends is another. Below you can find all the relevant information on Teemo abilities. In order for item builds you should check the build for Teemo.
Passive: Guerrilla Warfare
If Teemo stands still and takes no actions for a short duration, he becomes Invisible indefinitely. If he's in brush, Teemo can enter and maintain his Invisibility while moving. After leaving Invisibility, Teemo gains the Element of Surprise, increasing his Attack Speed for a few seconds.
Blinding Dart
Obscures an enemy's vision with a powerful venom, dealing damage to the target unit and blinding it for the duration.
Teemo fires a dart, Blinding the target for blindduration seconds and dealing calculateddamage magic damage.
Move Quick
Teemo scampers around, passively increasing his Move Speed until he is struck by an enemy champion or turret. Teemo can sprint to gain bonus Move Speed that isn't stopped by being struck for a short time.
Passive: Teemo gains passivemovespeedbonus*100% Move Speed while he hasn't been damaged by a champion or turret in the last passivecooldownondamagetaken seconds.
Active: Teemo sprints, gaining activemovespeedbonus*100% Move Speed that is not lost when struck for activemovespeedbuffduration seconds.
Toxic Shot
Each of Teemo's attacks will poison the target, dealing damage on impact and each second after for 4 seconds.
Passive: Teemo's Attacks apply poison, dealing an additional impactcalculateddamage magic damage plus totaldotdamage magic damage over poisonduration seconds.
Noxious Trap
Teemo throws an explosive poisonous trap using one of the mushrooms stored in his pack. If an enemy steps on the trap, it will release a poisonous cloud, slowing enemies and damaging them over time. If Teemo throws a mushroom onto another mushroom it will bounce, gaining additional range.
Teemo tosses a mushroom trap that detonates when stepped on. The traps Slow by slowamount% and deal totaldamage magic damage over debuffduration seconds. Enemies are revealed for the same duration.
Traps last mushroomduration minutes and are stealthed. A mushroom tossed onto another mushroom bounces before landing at its position. This Ability has maxammo charges (ammorechargetime second refresh).
FAQ on Teemo
What do you max first on Teemo?
Most Teemo pros max out 
Toxic Shot first.