Lee Sin is a great champion in-lane. (Team 1 - Regular | Team 2 - Off-Tank)
The main aspect of this build is Atmog's (Atma's Impaler + Warmog's Armor), but there are some aspect to maintain Atma's Impaler at his best, like Force of Nature. In the Off-Tank build i choose Madred's Bloodrazor instead of Force of Nature because of his passive: "Your basic attacks deal bonus magic damage equal to 4% of the target's maximum health". Then, we also have the assassin build that aims you to get the most advantage of lee sin's abilities for a greater damage.

My best score with the regular build (Team 1, First) was:
My best score with the assassin build (Team 1, Second) was:

My best score with the off-tank build (Team 2, First) was:

My best score with the assassin + off-tank build (Team 2, Second) was:

(The enemy tank got tanky real fast and i could not get the Madred's Bloodrazor)



(This are the results but when shown in my profile)

I believe that thoose 21 points into Offense give Lee Sin a great damage output through all the game.
The 9 points in Utility are so that he does not fall down in XP compared with his enemies. It's also so that he can use the Lizard Buff that i believe to give him a good help to get kills.

The choice of Greater Mark of Desolation and Greater Quintessence of Desolation is because Lee Sin above all his an assassin, so armor penetration his normally a good choice to get kills.
I also choose Greater Quintessence of Fortitude to get some extra health for the Atmog's. The Greater Quintessence of Vitality his so that he has a good health late game, since you just need to get to level 9 to get almost the same health that the Greater Quintessence of Fortitude.
Greater Seal of Resilience and Greater Glyph of Warding are just so that you can old your lane better against a Ranged Champion (Attack Damage or Ability Power).

In my assassin build, i choose to put 2 Greater Quintessence of Fortitude to get extra armor penetration and the Greater Quintessence of Vitality to get the durability in late game.

(You can use the other rune build if you prefer cause you what you lose in armor penetration in the other, you gain in health.)

For the start, you should get a Doran's Shield and aim for Boot's of Speed. If you are playing against a caster choose Null-Magic Matle. The boots that are best for Lee Sin are Mercury Treads because of Tenacity (reduces the duration of stuns, slows, taunts, fears, silences, blinds and immobilizes). Then come the Atmog's. Always start to get the Warmog's Armor and next the Atma's Impaler. The next item depends on the enemy team: if they do not have tanks, go for Force of Nature; if have a tank, take a Madred's Bloodrazor. Frozen Mallet it's just for the it's passive that helps you ganking champions that are trying to push. To end i choose Sunfire Cape because of it's passive that gives you a kind of a Lizard Buff and it helps to get more damage from the Atmog's.

In my assassin build i get a Doran's Shield and aim for Mercury Treads right away. Next i try to get Trinity Force for excellent damage after the use of an ability and movement speed and right away i try to get The Bloodthirster for the damage and the lifesteal. Next is Frozen Mallet because, as in all assassins, a slowed enemy gives you a great advantage to get a kill. Now the the fourth item depends on the enemy team. If they have a tank you should get the Madred's Bloodrazor, if they do not have tanks, you should get a Phantom Dancer for great attack and movement speed. Since the Madred's Bloodrazor gives you some attack speed, the next item his Black Cleaver for damage and attack speed to have an attack speed like the Phantom Dancer gives. If you get the Phantom Dancer, the next item should be Infinity Edge so that you have a great damage and some critical strikes.

I believe Flash and Ignite work very well with Lee Sin, since the Ignite let's you finish off the enemy champions faster and the Flash let's you get close to them easier, or if they try to escape.

You can also use Exhaust instead of Ignite if you prefer to try and get kills from your enemies faster.

Ghost is also a good choice if you think that your Lee Sin doesn't not need Flash. Ghost also let's you get to your enemies faster or if your enemies are pushing too much and you got to walk cause it's faster.

It was my first guide i ever made and i hope you like it and use it to your best. Also, please rate it and reply to me with you're feedback.

(I probably will not do a jungle guide for some time cause i basically suck at jungling)