Hello and welcome to my first and very short guide. i dont know much about Volibear but so far this is what ive come up with so enjoy my short guide for this Amazing bear!

Sorry for my bad spelling and such, english is not my native language.

Pros:
Tanky with good damage
Amazing passive
Armored Godamn Bear!
Umad Zilean?

Cons:
Slow but i try to fix that with these items
Has to get in range to be of any use
Can get easily kited
No Panda skin yet

Marks gives you some extra damage which is always good.
Armor Seals and Magic Resist Glyphs for more tankiness.
Movespeed Quints help our slow bear.

A standard 9/21/0 because we want to be tanky to help us last in fights and get close to the enemies so we can rip them apart before they rip us apart not gonna go into too much detail here.

Ghost: because it helps you chase and escape since volibear doesnt have any form of escape this helps
Exhaust: just use it on their carry or whoever is dangerous and your fine.
If you dont like these you can try switch them for Flash,Heal or Ignite

I take Q at lvl 1 because it helps alot if you are going for that first blood.
I max W first because it just does so much damage and you need that to be a threat.
I max E second because it helps chase and escape and gives you good damage.

There are three kinds of items Volibear really likes Hp, CDR and movement speed thats why i choose these items.
Every game isnt the same and sometimes you have to change up your items.
if you feel like, it you can switch either randuins or FoN for a Frozen mallet, Frozen heart or a Banshees veil.
Also if the Enemy team has very heavy CC switch swiftness boots with merc treads.

When laning try to last hit and not push the lane too much since Volibear is melee and can easily be ganked due to no escape abilities.
In teamfights dont charge in like the wild animal you are, try to wait for an oppurtunity to fling someone who overextends in to your team for an easy kill. dont retreat when low on hp your passive will keep you in the fight and since you are the tank you sometimes have to die.

Volibear is a pretty good jungler but i prefer him in solo top lane but if you feel like it go ahead.

A quick note: Always remember that Armored Bears are ten times better then Old Time Men Mmk?
So if you ever played Zilean i demand you punish yourself right this moment by spending your hard earned Riot points on some Bear skins.

Thats my guide feel free to comment or leave suggestions on how to improve the guide apart from adding more information