Pretty nice guide. It's good that you've managed to update the Runesbut maybe you'd change Teleportwith Ignitefor the burst advantage in the beginning that's good against most champions. Also geting a Doran's Blade instead of CLoth Armorbecause you're pretty tanky from the beggining and a little bit of damage won't do any harm.

You may want to update the "Runes" portion of your guide.

Moit Marine Revenge introduced static shiv garen, he is the best garen player in human history. Also u forgot that Garen has no cc, no disruption due to lack of cc, so how the **** does that make him a tank? Secondly, ur build is only good if your really really behind, other than that u should go cleaver and maw of malmoritus or Infinity edge then tank items; Garen needs 2-3 ad items to function properly. Other than that everything looks good except for the masteries and runes which tbh are ******ed (except for the 21 in offense, I give u a cookie for that part :D)
As u probably have figured, I play Garen with crits. Read my guide if u think im **** I have some garen game images of scores in lane and jungle. Tbh, garen in rank only works as a counter unless you know how to build to ur opponent and enemy team composition.

Absolutely not! While it has its advantages. The main reason people get this item is for the attack speed, which is not something Garen enjoys. If you really did like Statikk Shiv on him you may as well replace it with Trinity Force which seems better in my opinion.

Take out Frozen Heart, throw in Randuin's Omen.

You should also include a build order and other alternative items.

Statikk Shiv is surprisingly strong on Garen too.

Oh yea and BBC code exists. I'd advise you to check out this BBC code guide.