This is my build for Garen solo top, I have been using this build for like 800 games and I think it's the way to go if you want to play Garen, the Build have been altered a lot of times both after advice from friends and changes from riot. I hope you will enjoy this build and try it out before u down vote it, I put a lot of effort into making this so please don’t just down vote for no reason.
Throughout Valoran, the resolve of Demacia's military is alternately celebrated or despised, but always respected. Their "zero tolerance" moral code is strictly upheld by civilians and soldiers alike. In combat, this means Demacian troops may not make excuses, flee, or surrender by example. Garen, the valiant warrior who bears the title "the Might of Demacia", is the paradigm to which these leaders are compared. Thousands of great heroes have risen and fallen on the bloody battlefields between Demacia and its preeminent rival, Noxus. It was beneath their mighty banners of war that Garen first met steel with Katarina, the Sinister Blade. The infantrymen who beheld this event (and survived) commented that it seemed as though the two were locked in a mortal waltz set against a symphony of clashing blades.
Garen, the pride of the Demacian military and the leader of the Dauntless Vanguard, returned from this battle breathless for the first time in his career, though some speculate this was due to reasons other than exhaustion. The plausibility of these rumors was bolstered when, in every instance thereafter, Garen seized the opportunity to encounter the Sinister Blade again. A paragon of Demacian ethic, Garen never entertained such allegations, for he knew others couldn't understand. Even simply the pursuit of a worthy opponent on the battlefield is, to a true warrior, the reason to rise each morning. The promise of one, particularly one so beautifully and diametrically opposed, is the validation of his existence.
"The most effective way to kill an opponent is to slice through the man next to him."
Garen, on front line strategy.
For runes i use a tanky build with armor, MR and HP, to recive less damage and hp for better sustain in lane.
I use 21-9-0 i know thats pretty offencive for a tank but i think it helps to give him that little extra damage that secures the kills. It is also possible to go 9-21-0 if you want more deffence but i dont consider that nessesary.
For items you have to really consider the opposing team, normally I start out with Dorans Blade or Dorans shield. depending on who I will have to face in top, if it is a ranged DPS like Caitlyn who will poke me like hell I take Dorans shield, and if it's 1v2 top I also take Dorans shield however if I face someone like Nasus, Singed or Jarvan IV, or don’t have a jungler in my team I go Dorans Blade to facerape anyone who comes to close (with Doran’s Blade your Dececive strikeQ ability does 133 DMG at lvl 1). Depending on how I’m doing on the first trip back I buy, Boots of Speed, 2 Long Swords/ The Brutalizer if I’m doing well. If I’m experiencing a lot of harass I prefer to bur Chain mail or if I got the money Giants belt for Sunfire Cape. In a game where I get some early kills or a lot of harassment on the enemy I would go for Boots of Swiftness and The Brutalizer quickly to keep up the harassment and also get a little CD reduction, after The Brutalizer I will get my Sunfire Cape. When I have those items I will look at the enemy team and figure out if I should get Warmogs armor or Force of Nature next, almost every time I get Warmog's Armor first, but if against a very caster heavy team u could get Force of Nature. If u get to late game and feel like u keep dieing, take a look at what kind of damage u receive and then get Thornmail or another Force of Nature, if the damage is both Physical and magical u could get a Guardian Angel. And in the very end exchange your damage item for atmas impaler or upgrade to Youmuu's Ghostblade.
Pros / Cons
[*] Insane sustain, if you are low hp, just get out of range for at minute and then you will be fine again thanks to his passive.
[*] Awesome damage
[*] nice farming
[*] good at sequring kills
[*] Almost impossible to slow
[*] easy to poke
[*] if killed a lot early game it can be difficult to come back.
As earlier mentioned Garen is an exceptional farmer and alsmos as soon as you have either The Brutalizer or Sunfire Cape you can clear a entire minion wave with just Judgement (W). however later on in the game you should be carefull not to steal farm from your teammates since there is a lot of champions who need the farm more than you.
This was my first build so i hope you like it please give comments and imput :).
Also to repeat myself just a little i hope you dont just downvote without atleast reading the build, however if you try it out and it dosen't work for you please comment and say what went worng and what could be better.
Summoner name: Sapientum