Wazzup guys?! This my first guide so it may not be the best, but im sure it will help you in you in learning Lee Sin. He is my favourite champion 'cause of his power in early game. If you get feed at the beggining of the game, the rest is easy...but if not the late game will be a problem for you. It's a hard champion but fun to play! Enjoy my guide and please vote ^^ !

Pros:

+Very powrfull in early game
+Good at jungle/ counter jungle
+Nice combos
+Fun to play
+Very good ganker
+Has 7 abilities
[color=#008000]+[/color]Has energy , not mana


Cons:

-Quite hard champ
-Not the best in late game
-He is nothing when silenced
-Hard to aim his skills
-Bad against tanks

Here is an intersting thing! You can choose either to play aggressive (only ad) or balanced offensive (ad, armor penetration, magic resist). I like to play agressive, even if a bit strange. If i need armor penetration i ussualy take last whisper durig the game.

If you are solo top you must start with Q ability. Now it depens if the enemy wants to fight or not. If he does choose W ability because its better when 1 on 1 and if not take the E to slow him down while chasing with Q.
If your in jungle, start with E ability to hit all minions, then go for W so you can have armor and lifesteal. Use Q the last for the ganks.

Thats the best part of the tutorial :D
The first one is when ganking: After you decide to gank let the enemie push a bit, then use Safe Gurad/ Iron Will to dash to your allie, then Tempest/ Cripple to slow down your enemy and continuing to hit him with aa or use Sonic Wave/ Resonating Strike while waiting for cooldowns. Dont forget to use your passive Flurry to regain your energy! Thats one way to gank under lvl 6, but after you got the ulti its easier. First use Sonic Wave/Resonating Strike to reach the enemy, then Tempest/Cripple or Exhaust to slow him down. After this try to get in front of him and use Dragon's Rage to knock him back to your turret or your allie, and keep hitting until he dies.
Now that was the gank. When 1 vs 1 until lvl 6 your best friend is your passive. Being very powerfull in the early game you must do as many kills as you can at that time. Try to use Safe Quard/ Iron will as much as you can because it gives you lifesteal and armor and if he tries to escape slow him down with Tempest/ Cripple and chase him with Sonic Wave/ Resonating Strike. When you fight, asa i said, your best friend its the passive because it gives you 40% attack speed for your next 2 auto attacks and you gain 15 energy for each hit. So for exemple you use Sonic Wave/ Resonating strike dont use'm both 1 imediatly after another. First do sonic wave, hit him twice (becuase of passive) and then use resoonating strike.
Now after lvl 6 its intersting :D. You must use the same thinghs i told you earlier. We all now that is quite hard to get in front of the enemy to use Dragon's Rage when 1 on 1 and knock him back to our turret... so if you just wanna take damage with your ulti use this: Sonic Wave, Dragons Rage, Resonating Strike and get back in the fight after you took a lot of damage =). Dont forget that your ulti also knocks in the air and takes damage to all enemys that are hit by the one you used the ulti on.