Lee Sin has been one of the most popular and strongest junglers in both solo queue and competitive play for a while now. He has a lot of tools at his disposal but he takes a while to master. Lee Sin is really strong early game which he can use to pressure lanes or the enemy jungler. From there, Lee Sin scales into the mid game by taking vision control of the map with his mobility and Sightstone, then transitions into a utility based tank late game.

PROS
+ Strong early game
+ Fun to play
+ Very high skill ceiling
+ Fits into any team comp

CONS
- Doesn't scale well
- Hard to play

(Passive) Flurry
Lee Sin's passive gives him bonus attack speed for two auto attacks after you cast a spell. Each autoattack restores energy as well. This makes it ideal to space one or two autoattacks in between your abilities when jungling or fighting to keep up your energy and make use of the attack speed.

(Q) Sonic Wave / Resonating Strike
Cooldown: 11/10/9/8/7 seconds
Lee Sin's Q is a skill-shot nuke that deals damage, reveals, and allows him to cast it again to dash to the enemy and deal more damage based on how much health they're missing.

This is Lee Sin's core ability in the early game, being able to hit your Q is everything. I've found that being patient with the Q is the best way to hit it. If you shoot it at max range it's easy for people to dodge, but if you run at your enemies they'll usually waste time juking and allow you to catch up to them due to Lee Sin's high base movement speed, or they'll run away in a straight line which makes them easy to hit.

There is a huge urge to want to follow up on any Q that you hit but be careful because it's not worth it if it gets you killed.

(W) Safeguard / Iron Will
Cooldown: 9 seconds
Lee Sin's W is a dash that he can use on himself or allies that gives a small shield for 2 seconds, it gets a reduced cool-down if it's used on a champion (including himself). If he activates W again, he gains a lot of life steal and spell vamp for 4 seconds.

There are a few tricks with Lee Sin's W that can make it more effective. I'd recommend that everyone who plays Lee Sin to make a separate hotkey to self cast this ability, because it's a lot easier than moving your mouse to target yourself every time you want to use it while clearing the jungle.

Another way to make use of this ability is by using it to jump to wards. Ward jumping is a huge part about playing Lee Sin. To make it easier, make sure you smart cast wards and this spell so that you can do it really fast. I set my smartcast item slot 2 hotkey to C, so when I want to ward jump I press C then W at the same point which makes the ward jump really fluent.

You can also use your W to cancel the 2nd part of your Q. You can use this to dash at an enemy to make them think you're going on them then jump away before the ability connects. It won't do any damage but it can get in your opponents head or make them waste spells thinking that you're initiating. Just be careful because the dash from your Q goes really fast and if you press W too slow you'll go all the way in.

(E) Tempest / Cripple
Cooldown: 10 seconds
Lee Sin's E is an AoE magic damage nuke that also reveals units that he hits. Activating it again will slow everyone's movement speed that got hit by the initial E.

This ability is a bit underwhelming after the 4.13 nerfs because it doesn't slow attack speed any more but it's still a nice AoE slow and nuke.

The only trick with this ability is that you can E then Flash and it makes your E apply to the area that you Flashed to. You won't use this trick every game but sometimes you can catch people off guard with it because it's faster than using Flash then E.

(R) Dragon's Rage
Cooldown: 90/75/60 seconds
Lee Sin's ult is a high damage nuke that knocks his target backwards and knocks up any enemy that the target gets knocked into.

Lee Sin's ult can be used a ton of different ways which makes incredibly versatile. You can initiate a fight by getting behind someone and kicking them into your team, you can kick someone through the rest of their team to knock up all of them, you can use the kick to peel for your carries, or you can use it to "secure" kills for yourself.

You can also ult then Flash just like you can with the E. It's pretty hard to do and it runs the risk of wasting your ult and Flash to save an enemy, but if you pull it off it's almost impossible to react to and looks really cool.

(Early Game)
In the early game, pay attention to where the enemy jungler starts and which lanes from each team are vulnerable. If the other team's top laner looks gankable, then start on the buff closest to your bot lane so that you can show up top at level 3 with double buffs. If you think it's likely that your top laner is gankable and you see that their jungler started on the bottom buff as well, you can always hide in the bush and look for a counter gank. If you have a really good jungle match up (aka most champions other than Elise), then feel free to counter jungle the other jungler. By fighting the other jungler and taking his camps, it sets them behind and takes pressure off of your lanes because you have vision of their jungler.


(Mid Game)
Mid game is the period of time when you have Spirit of the Elder Lizard and Sightstone and at this point in the game you want to put as many wards down in the enemy jungle and look to make plays with Dragon's Rage every time it's up. Lee Sin can do dragon pretty easily once he has 2+ points into his W so look to secure that every time it's up. Keep checking buff timers and coordinate invades with your team to steal enemy buffs.

(Late Game)
Late game can be a bit awkward on Lee Sin, if you build tanky then you aren't really strong enough to kill anyone and if you build damage then you'll die if you ever go into a team fight. The most useful thing for Lee Sin to do in team fights is to either kick one of their carries into your team or peel for your carries. Try to apply your E to as many people as you can and hope your carries are strong enough to win the fight!