Hi, my name is xDestinyyX. My current elo is 1400. This is my Olaf Guide, due to his buff he has become more balanced and viable for both jungle and solo top. I hope you enjoy it.
(ily MaXxyyyy)

Marks
+ Armor Penetration. True Damage.
+ Attack Damage. Early Game Buff
Seals
+ Armor. Sustain in Lane
Glyphs
+ Attack Speed. Easier to last hit.
+ Magic Resistance. Sustain in Lane

DPS
21-9-0 (Armor/Damage Output)
Tank/Jungle
10-10-10 OR 0-21-9

STANDARD BUILD
Wriggles - Sustain in Jungle/Solo Top. Free Ward every 3 minutes. Great Item for Early Game.
Heart of Gold - GP5 OH YEAH!
Mercury Treads/Ninja Tabi - Magic Resistance/Armor.
Warmogs - Nice Health Boost.
Atmas - Best AD Item for Olaf.
Frozen Mallet - Great CC and Health at the same time.
Omen - Good CC Slow and Health/Regen

SITUATIONAL ITEMS

Max E. True Damage is the reason Olaf is such a strong pick.
Max W Next. Good Sustain in the Lane and this is why he is a good solo top.
Max R After. Its his ultimate. Obviously you are going to put a point in it at level 16. Its what maxs Olaf unique.
Max Q Last. Good abillity but don't max it til last.

Ghost
Explanation: You want to try and have this up every fight. This is mainly why I go ultility, the ability to chase down their low HP champions have only warmogs and no dmg items, to destroy them with your E and Q. Makes you so scary and unstoppable. Use this to chase, run away, everything. This skill will give you pentakills.

Teleport
Explanation: Get back into lane as quick as possible and farm up. Great summoners spell for solo top.

Other Good Choices

Pros
Good Poke
High Sustain
Great Damage Output
Throws Axes and says FUS RO DAH!

Cons
Can't hold lane for long
Gets CC'ed hard
Low Mana
Can't 1v1 most champs.

Chase their squishies or protect your own, take your pick.

Choose a good time to run in with your ult and ghost, because one wrong initation can have you hurting. Positioning yourself where you can throw an axe and have your team follow up is really important. It's really straight forward like singed running in with ghost and poison, slow.

Press ult when you get cc'ed and you need to get out of it instantly to rape.

Press ult if they're ALL targeting you to reduce the damage with your ult.

"OLAF WAS NEVER WEAK YOU JUST SUCK

OLAF CAN SNOWBALL AND DESTROY EVERYTHING

OLAF IS HERO MODE

OLAF IS OLAF

OLAF IGNORES CC LIKE A BOSS

OLAF THROWS AXES LIKE A BOSS

OLAF SUSTAINS AND HITS YOU FOR 20% OF HIS LIFE BACK LIKE A BOSS

OLAF HITS YOU FASTER WHEN HES DYING REAL MAN BRO

OLAF HAS A SPELL THAT IGNORES ALL RESISTANCE AND THROWS LIGHTING LIKE HES ODIN LIKE A BOSS"

-Dyrus Quote

Thanks for Reading my Guide. I hope you enjoyed it as much as I did.
:)