Best start on Garen, since he is melee, you need speed to get to your opponent or away from him. The Pots help you to sustain in combination with your passive. You are fast enough, so if you do not invade, take 4 Pots.
Not the best start, but if you are facing a ranged harasser like Nidalee or Gankplank it can help you to survive the first levels. However, you are slow and do not have a possibility to heal with Pots. The buffed HP-Regeneration grants you with your Masteries and your passive an really nice amount of sustain.
helps you trading and gives you a little bit of extra sustain and survivability. In a matchup you are dominating like Akali or Shen you can run Dorans Blade for extra lane dominance.
I prefer starting with the Brutalizer, because it provides you with AD, Armorpen and CD. After Trinity you can upgrade it to the Black Cleaver. Also you should build a Avarice Blade, when you want to build Yomuuns or when you are ahead and lanedominant. Avarice Blade really boosts your income when you can lasthit safe.
Opening with Hexdrinker allows you to survive against AP like Teemo, Akali, Cho'Gath and Vladimir and outtrade them with your damage.
is my standard. Just gives more movementspeed and keeps away these anoying slows from you. Speed is always good providing more offensive and defensive potential to increase your lanedomination, but they are not this good when you are about to loose your lane.
I would recommend against really hard CC or a team stacked with AP. Sometimes it is better to do without QSS and buy Mercs instead.
is an good option against AD-Harass or AA-heavy champions like Gankplank, Jayce, Nidalee, Pantheon, Tryndamere or Yorick.
I feel like this is the best Enchantment for your boots. You do not need a reduced Flashcooldown and you do not need Speed after an Attack, because you want to engage with full movementspeed.
STANDARD (BUILD THIS EVERY GAME):
I consider Trinity as the best item for Garen. Sure, it is expensive and Mana plus AP are wasted stats. In exchange for that you get Movementspeed, Crit, AD, AS, HP, a slow and a really fitting passive. Your Q will easily reach 500 damage only because of Trinity stats plus the buff. I usually start build it with Phage, after that I prefer Sheen over Zeal.
Always build this after Trinity! During its change the Black Cleaver got more viable especially on top bruisers. Since it applies also on your E, BC is even after the nerv OP on Garen and should be in every lategamebuild. The stats are very strong and you can make your presence felt easily in every teamfights because you just have to hit your E on everyone, what is pretty simple, and the enemy team has no longer any armor. If you build Avarice Blade before Black Cleaver just keep the Avarice Blade for the gold and sell it when you need a free slot.
If Garen is not anoying enough, with this item he gets. Even if he does not get healed so much, your burst after reviving will win the teamfight even if you die irrevocabile. Helps you keeping Oracle's longer.
When you bought a Hexdrinker you should upgrade it to this item. The shield combined with Guardian Angel makes you incrdible hard to kill.
A must in every team. Get it when noone in your teams wants to build it.
Get this item when they have a ton of CC and Mercs are not enough to deal with it. Helps also against blind and bleeding. Incredible to use after the first wave of CC to cancel all of them and run into the enemy team.
makes you a pain to focus and wins almost alone 1vs1 against anybody.
gives actually nice def and even more AoE. It draws towerattention however.
provides a lot of useful stats if you need more def. Remember to use the active abusing the slow for killing potential or escaping.
Normally you should not build this item, because it does not help you at all, even before the nerv it was just bad to buy it. Due to his W Garen really benefits from resistances, and just flat HP makes you seem tanky, but lategame ADCs will shred through your life in a second and they will thank you for the easy lifesteal. However, against truedamage (like Olaf or Darius) Warmogs is still pretty useful, so when you lane against them, consider buying something like Black Cleaver into Warmogs, that will make you ignore their truedamage.
A Item which could be created excluxively for Garen. It is cheap and provides really useful stats improving your ability to trade and also improving your whole team with the aura. I see this item rarely so you can buy it really often. Do not buy it when the jungler or the support builds it, but ask if you can buy it.
If you got Trinity this item really helps Garen out with chasing and trading. It works perfectly against HP-stacking targets and it helps you a little bit with sustaining.
This is a absolut lategame choice if the enemies are stacking armor. I would go for it earlier if they have Malphite, Rammus or Taric, but after the huge buff on Black Cleaver it is not this essential anymore.
This item was pretty long a coreitem on Garen, but the Black Cleaver just outclasses it. You can still build it, the passive is still nice and the stats are also okay.
after buying this item and stacking it your trading potential will grow extremely. The lifesteal helps you surviving teamfights. I would recommend it only if your fed.
this item makes Garen an AD-Carry. Your E will do awesome damage due to the fact it can crit and does then 250% of your high AD.
MISINVESTMENTS (NEVER BUY THESE):
THe worst item ever on Garen. It gives barely offensive stats and Garen does not need HP, he needs resistances. The slow is the only thing Garen could make use of, but you will have enough movementspeed to catch up to any target.
On Garen you should never buy HP, so this item is useless on Garen. Avoid it.
DO NOT FORGET:
Basically you always want to build the standart and this will take at least the whole early- and midgame. After you finished Boots, Trinity, Black Cleaver and GA, you want to add some more defence to your build, but sometimes more offensive potential can help to end games earlier. Here are some Examples of builds against different teamcompositions.
Defensive build against balanced team.
Defensive build against AP-heavy team.
) Defensive build against AD-heavy team.
Offensive build against balanced team with much Armor.
Offensive build when stomping everything.