Renekton is an incredibly strong top laner who excels at taking damage for his team while taking very little.

MR-Magic resist
CDR- Cool down reduction
AD- attack damage
Ap- ability power
CC- crowd control(stuns, slows, etc.)
Ult- ultimate
DMG- damage

Renekton is a great mix of a Tank and a Bruiser. Early on he can not do much forcing players to play very safe but after lvl 6 with the right items he is a beast. Your role is to peel for others sponge up DMG and shred down armor.

Pros:
+Uses no Mana
+Tanky
+Can dominate if he gets ahead
+great farming
+good mobility
+Godlike sustain
+Ult can be used to do more damage and to take less

Cons:
-Has to play VERY same early on
-requires expensive items for his DMG and tankyness
-Has to get up close for damage meaning CC can be a problem

Passive: Reign of Anger

Renekton gains 5 fury for every autoattack he makes. This fury can empower his abilities with bonus effects. Additionally, Renekton gains bonus fury when he is low on life.
This passive is great it buffs his abilities at the cost of 50 fury and rplaces mana
Q:Cull the meek

Renekton swings his blade, dealing physical damage to nearby enemies and gains a percentage of its damage as health.
50 Fury Bonus: Damage increased to %150. Healing increased to %200 but capacity is tripled.
Cooldown:8 seconds

This is probably Renekton's most useful tool for it's ability to clear waves, sustain and deal large amounts of DMG to many enemies not to mntion the low cooldown.

W:Ruthless Predator
Renekton's next attack strikes twice, dealing physical damage and stuns for 0.75 seconds. Each hit applies on-hit effects.

50 Fury Bonus: Instead, Renekton attacks three times(that means damage increase to %150), dealing physical damage and stuns his target for 1.5 seconds(double the ordinary stun).
Cooldown:13/12/11/10/9 seconds

This is a great tool is Renekton's arsenal to deal damage and stun. It can stop fleeing enemies, stop heavy Damage dealers from hurting your team and holding enemies in place for you to harass

E:Slice and dice

Renekton dashes, slicing for physical damage. Hitting an enemy grants the ability to use Dice for 4 seconds.

Dice: Renekton dashes, dealing physical damage.

50 Fury Bonus: Dice does more damage. Enemies hit have reduced armor for 4 seconds.

Cooldown:18/17/16/15/14 seconds
Range:450

This ability is great and can be used in many ways, to escape, to hunt and to move around.
If you hit an enemy with this ability you can use it again for a short amount of time making this an excellent tool to move around. Below is a chart of how you can use this ability to move over walls

Last is R:Dominus

Renekton surrounds himself with dark energies for 15 seconds, gaining health. While active, he deals magic damage to nearby enemies and gains 5 fury per second.

Cooldown:120 seconds

This ability is very close to Nasus's Ult and is very powerful as well. The ability lets Renekton gain health and do passive DMG. the ability can be helpful to survive or in a team fight if you want to do more DMG while taking less.