Against garen, Garen’s build path can be very different from game to game. Keep an eye on his itemisation and play accordingly depending on what he is buying. If he is going full damage, you probably won’t be able to fight him alone.
 
It will be difficult for Garen to engage or get on to carries in a team fight as he lacks hard CC. This means that he will try to flank in team fights with his Q. Make sure you ward to the side of you at all times and kite backwards as soon as he appears.
 
Avoid wasting valuable resources like Summoner Spells or Ultimates on Garen unless you’re certain you’re able to kill him. Garen can quickly top up his health bar back to full thanks to his Passive which will result in your team losing out on key spells for the remaining of the fight. Against garen, Garen's construction path can be very different from one game to another. Keep an eye on its itemization and play according to what it buys. If it's in full damage, you probably haven't been able to fight it alone. It will be difficult for Garen to engage or start a team fight because it lacks hard CC. This means that he will try to flank in team fights with his Q. Make sure that you keep your side at all times and kite upside down as soon as it appears. Avoid losing valuable resources like Summoner Spells or Ultimates on Garen unless you are sure you are able to kill it. Garen can quickly complete his health bar full thanks to his Passive that will lead your team to lose on key spells for the rest of the fight.