This is my first guide so i don't know how to do all that fancy stuff that people know how to do. What i do know however is Lee sin. Lee Sin is a melee bruiser who has an extremely strong early game. He is also a incredibly fun champion to play whom pretty much never gets old no matter how many times you play him. He has no hard counters, is viable in high level play, and has incredible mobility. Lets get started shall we?

Lee Sin has a super strong early game and a weak late game. It would be dumb not to abuse that. Top lane gives him more gold and more of a chance to abuse this early game. The reason i don't like him in the jungle is because if Lee Sin fails at a gank or two he will generaly fall behind, and when Lee Sin falls behind he doesn't exactly catch back up. Pretty much wasting his strong early game. Not only that but Lee Sin can beat pretty much any champion on top when you get good at him.

Pros
Extremely fun to play
High Skill Cap
Just an overall cool Character
Viable at high level play
Countered by none
High Mobility
Just unbeatable when mastered

Cons
High Skill Cap
Q is Unreliable
Weak late game
Transitions into a peeler late game (Peeling is the act of removing a enemy off a teammate with slows, stun, and knock backs.)
Gets banned in ranked or picked first quite a bit.

3 Greater Quintessence of Attack Damage You want the strongest early game possible and these runes will boost that significantly.

9 Greater Mark of Attack Damage To raise your early game damage as well.

9 Greater Seal of Armor When you top lane your most likely going to fight and AD champion. Taking armor seals will improve your survivability against these champions significantly.

9 Greater Glyph of Scaling Magic Resist If your not fighting an AP top these are the better choice as they scale into late game better.

OR

9 Greater Glyph of Magic Resist If you know your going up against an AP top lane champ (Ie: Kennen) it is better to take these as they offer more early game Magic Resist.

Lee Sin can go either very defensively or very offensively. It comes down to play style when choosing as more aggressive laners and players go for a more offensive build. I recommend new players to Lee use the defensive tree until they are used to him then make the switch.