Hello and welcome to this guide!

I'm Snorkil, a 21 year old streamer for FNATIC
I've been challenger since season 4, and peaked rank 13 in season 8, rank 1 in season 9 and so far challenger in season 10.

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Pros + Unique playstyle + Can surprise enemies in different ways + High outplay potential + High mobility + Gap closor + Fun to play Lee Sin is a really fun and great champion to play, he's really strong in the earlygame and scales good towards the late game, he has a lot of playmaking potential aswell as outplay potential

Cons - High skill cap - Needs a lot of practice - Bad playing from behind - Needs to snowball to dominate Lee Sin needs a lot of practice before you get good with him, hes one of the hardest champions in the game to master. If you still want to play him, make sure to practice a lot and learn all the small things about him, as he is really mechanical.

Lee sin in the early game is really strong.

You dominate almost every 1v1 and have a great powerspike at lvl 3.
A good early path is Red - Golems - Blue - Gromp giving you a early lvl 3, and then you can look for a gank or take 1 more camp into scuttle.

Another would be Red - do full clear on your blue side, and then look for a gank/scuttle/invade.

Taking golems early is really important, as its the best camp on gold + xp

So in the Early game you should try to snowball your lanes as much as possible, or snowball yourself.

Go for a lvl 3 clear ( like the one i have shown ) and try to get a gank going! Lee sin has a lot of mobility over walls, so you should try to use that to your advantage. Ward jump over walls to avoid wards, Use q to drake and run away so you avoid wards in the bushes on botlane/midlane - this is also really good for invading enemy jungle.

When you get to the midgame / lategame you have different options on how to play. If you are really ahead and fed you should probably look for teamfights or picks and try to nuke targets, you could also play around your sidelaner(s) and get picks with them.
Pro players have 2 ways of playing Lee Sin in the mid/late game. Either you are a playmaker or you kite for your carries. In most cases they kite for their carries as it's not really easy to do insane Insec plays on other pro players, as they know how to respect it and position themself aswell as outplaying the Lee Sin. So in any case you can always play for your carries, which means you will nuke down any guy that tries to get your carry, or kick him away with your Dragon's Rage

Hard Matchups

When you are in a hard matchup you need to respect them and your pathing needs to be good, cus' if you fall behind against these guys, you will have a hard time finding anything to do in your game.
If they have a heavy farming champion like Nocturne try to get early gangs of knowing he will most likely not be there for a counter gang, so if you can get your laners ahead before hes 6, that would be really good! If you are against a heavy ganger, try to track him and counter gang, if you get ahead early you might go from a hard matchup into a matchup you can actually win!

Udyr

Rammus

Rek'Sai

Nocturne

Jax

Decent matchups

These matchups means that it can go both ways and is all about how the early game goes!

Ivern

Karthus

Xin Zhao

Good Matchups

You will most likely win these matchups, make sure to invade and use your lead by using pressure against them!

Twitch

Taliyah

Gragas

Amumu

ECLIPSE ECLIPSE is a Core JNG item, must go for this, could go for the 1 with blue smite, but red smite is in general better, as you fight 1v1 a lot

PLATED STEELCAPS PLATED STEELCAPS is great if enemy team is AD heavy

Mercury's Treads Mercury's Treads is great if enemy team is CC or AP heavy

The Black Cleaver The Black Cleaver is a really good item for Lee Sin as it gives AD, CDR and Health which is 3 things he really needs. Pick this up if enemy team has a lot of tanks or if u arent really snowballing hard

Guardian Angel Guardian Angel is great, pick this up everygame

Youmuu's Ghostblade Youmuu's Ghostblade is great if you are snowballing early and enemy team is mostly squishy champions

Sterak's Gage Sterak's Gage is perfect if you want to become a bit more tanky aswell as getting more dmg, get this in the mid/late game

Duskblade of Draktharr Duskblade of Draktharr is good with the Youmuu's Ghostblade build, as you nuke down squishy targets really easy

Randuin's Omen Randuin's Omen is great if you want to get a bit more tanky stats and if enemy team is AD heavy.

Maw of Malmortius If the enemy team is AP heavy Maw of Malmortius is a perfect fit for you!

Ravenous Hydra If you want to deal a bit more dmg, pick this up instead of Titanic Hydra

Titanic Hydra You can also pick up Titanic Hydra if you want to be a bit more tanky instead of buying Ravenous Hydra

Flurry(P): After Lee Sin uses an ability, his next 2 basic attacks gain Attack Speed and return Energy. Play Video
Sonic Wave(Q): Lee Sin projects a discordant wave of sound to locate his enemies, dealing physical damage to the first enemy it encounters. If Sonic Wave hits, Lee Sin can cast Resonating Strike for the next 3 seconds.
Resonating Strike: Lee Sin dashes to the enemy hit by Sonic Wave, dealing physical damage based on the target's missing Health. Play Video
Safeguard (W): Safeguard: Lee Sin rushes towards a target ally, shielding them both from damage. If a shield is broken, half the energy cost is returned. After using Safeguard, Lee Sin can cast Iron Will for the next 3 seconds.
Iron Will: Lee Sin's intense training allows him to thrive in battle. For 5 seconds, Lee Sin gains lifesteal, spell vamp, and armor.. Play Video
Tempest(E): Tempest: Lee Sin smashes the ground sending out a shockwave that deals magic damage and reveals enemy units hit. If Tempest hits an enemy, Lee Sin can cast cripple for the next 3 seconds.
Cripple: Lee Sin cripples nearby enemies revealed by Tempest, reducing their Movement and Attack Speed for 4 seconds. Movement and Attack Speed recover gradually over the duration. Play Video
Dragon's Rage(R): Lee Sin performs a powerful roundhouse kick launching his target back, dealing physical damage to the target and any enemies they collide with.
Dragon's Rage: One of the most popular spells in the game, known for the famous "Insex" phrase and more! Using Dragon's Rage you will knock the targeted enemy in your direction and knock up any enemies he collide with. Play Video

You should watch this video for great explanation about how to do the insane lee sin insec, and the most advanced mechanics you can possible do on Lee Sin.
Sit down for 15 min and watch it through, trust me, you will learn a lot!
Play Video

Thx alot for reading through my guide and getting down here!

Lee Sin is a really popular champion among pro players and high elo junglers, hes really mechanical and require a lot of skill

I would appreciate if you would drop a like if you enjoyed this guide, as it would help me a lot, and you can always check out my stream if you want to see some high elo gameplay or if you got any questions about anything ( i can answer most of the league related ones ;) )

Overall i think Lee Sin is a great champion for Soloq and competitive, he has great outplay and carry potential and is also really fun to play, i would recommend picking him up if you are aiming to become really good at 1 champion!