Welcome everyone, to the Lee Sin build, I am excited to present this as my first actual build, that actually works with improvements I will try posting as much as I can. Thank you for being patience. I decided I want to share this build with the rest of you, even though it isn't technically fully done. In particular, I'll go over lane explanations, farming, etc. Don't get mad about the "Fighting Against Champions" chapter, it is incomplete. When I get the time, or when I feel like it, I play Lee Sin in a 3v3, taking top lane, fighting against champions to write my experience and what I think needs to be done. So that is all opinion, if you don't have as much trouble as I do, you DO NOT need to follow it.

Btw, I'm not so good with runes, so if you have a better style, let me know, I'll try it out, and fix the build, not to mention, credit you aswell.

Skills

After Lee Sin uses an ability, his next 2 autoattacks within 3 seconds gain 40% attack speed and return 15 energy each.

Now this is very useful. Just by using a simple ability he gains more attack speed. I'll tell you how I mostly use this to my advantage. When you're in a fight, you don't really have time to space out your hits from your abilities, because the abilities do great damage alone. I'd recommend waiting to auto attack until you've used all your skills. The part for using your passive in my opinion is dropping towers, shoot a sonic wave at a minion, hit the tower, resonating strike, hit the tower, tempest, hit the tower, etc.

Lee Sin shoots a wave of sound in a line, dealing physical damage of 50 / 80 / 110 / 140 / 170 (+0.9 per bonus attack damage) to the first enemy it encounters and revealing it for 3 seconds. If Sonic Wave hits, Lee Sin can cast Resonating Strike.
Cost: 50 energy
Range: 975

Lee Sin dashes to the enemy revealed by Sonic Wave, dealing a base amount of damage plus 8% of their missing health as physical damage. Monsters take a maximum of 400 damage.
Cost: 30 energy
Range: 1100

Sonic Wave/Resonationg Strike is your most important move ever! Main source of damage, chasing, and initiating! Use this whenever you possibly get the chance to. Not much more to it. Helpful combos are, Sonic Wave/Resonating Strike, Tempest/Cripple, Safeguard/Ironwill, Auto attack, Dragon's Rage.

Lee Sin shields himself, or dashes towards a target ally unit, shielding them 40 / 80 / 120 / 160 / 200 (+0.8 per ability power) both from damage for the next 5 seconds. After using Safeguard, Lee Sin can cast Iron Will within the next 3 seconds.
Cost: 50 energy
Cooldown: 9 seconds
Range: 700

For the next 5 seconds, Lee Sin gains bonus Spell Vamp & Lifesteal: 5 / 9 / 13 / 17 / 21% Armor Bonus: 10 / 15 / 20 / 25 / 30
Cost: 30 energy

Safeguard/Iron Will. Even though I get this move last it's always useful to pop both of them if you're low on health or just for the lifesteal, spell vamp, and armor. I'd recommend popping it whenever needed, attacking minions, running away, fighting champions, team fights, taking buffs, etc.

Lee Sin smashes the ground dealing 60 / 95 / 130 / 165 / 200 (+1.0 per bonus attack damage) magic damage to all nearby enemies and revealing them for 4 seconds. If Tempest hits an enemy, Lee Sin can cast Cripple within the next 3 seconds.
Cost: 50 energy
Cooldown: 10 seconds
Radius of AoE: 350

Lee Sin cripples all enemies revealed by Tempest reducing their movement and attack speed by 30 / 37.5 / 45 / 52.5 / 60%. The movement and attack speed recover over 4 seconds.
Range: 500
Cost: 30 energy

Now this move is amazing for the slow and AoE nearly makes Lee besides his Sonic Wave. Now, I'd recommend using this after initiating, to stop the opponents from escaping, or use this while running, to increase your escape rate if you are trying to run away.

Lee Sin performs a powerful roundhouse kick, dealing 200 / 400 / 600 (+2.0 per bonus attack damage) physical damage to the target and knocking them back. Enemies the target collides with take the same amount of physical damage and are briefly knocked into the air.
No cost
Range: 375
Knockback distance: 1,200 (estimate)
Cooldown: 90 / 75 / 60 seconds

I love this move, it's so amazing how you can just kick someone in the face and they just go flying! Not to mention knock someone up that was in the kick as well. Use this move for escaping, kick the opponent in the face and run! Or use this as a finisher to imply that three bars of damage towards the end of your combo. Simply to help with the team, you can project this move backwards, by using Tempest then Cripple, walking infront of your opponent and using Dragon's Rage to kick them back! Those are the uses I see for this move, not to mention it's really good damage.

Summoner Spells

This spell is just useful in so many ways, flash to get in those fights or out of those fights. Save yourself or just initiate!

Use this to your pleasure, I normally take this just incase the slow of cripple does not work, or any other needs for initiating, escaping, or helping teammates. :D

Runes

Greater Mark of Strength{9}

For that attack damage early game, it can really give you a head start in dropping your opponent!

Greater Seal of Resilience{9}

Keeps you in a pretty good place with armor at the beginning of the game.

Greater Glyph of Shielding{9}

Good with magic resist late game and such, really helps out.

Greater Quintessence of Strength{3}

Even more damage for that early game and late game power!

Pros

-Insane amounts of kills
-Great lane pushing
-Insane damage
-Decent durability
-Tower diving
-Easy tower breaking
-Easily fed
-Amazing escaping abilities
-Independent

Cons

-Not so good late-game
-Possibly bad early
-Bad early-game against enemies with a lot of health

This is simple, as much as you can, try to convince your team to let you top, it's better for Lee Sin, and it works out great for your team! Ganking is also very necessary, to help out your team of course! Good luck!

Alright so, fixing this, FoN isn't such a good item on a Lee Sin, as said in the comments, I would like to thank you for that, cause I really have payed attention, and it isn't. Now, at the end of the game, depending on their team, are they building armor? I'd recommend getting a Last Whisper. If they happen to be really strong towards you, I'd recommend getting a Thornmail, in replace of your Brutilizer.

NOTICE:

Every champion I do not list, I don't find dangerous neither a threat, though, I am playing matches to find more champions I fight against, threatful. I will update this as soon as I have a new champion to introduce. Thank you.

I like to start with Teemo, a good AD counter(sometimes) to talk about, now, Teemo isn't always a threat to Lee Sin, make sure to harass him by constantly casting your Sonic Wave towards him, followed by a Resonating Strike, then again use Tempest to Cripple if you can. then safely Safeguard your way back to a minion. On the other hand, if you want to kill that Teemo! Engage in a fight with him, but first, make sure not to use your sonic wave just yet! You'll re-initiate with that later. After he shoots the blinding dart at you, I'd recommend trying to keep away from him, but as soon as the blinding dart wears off, attempt leading in towards him with your Sonic Wave/Resonating Strike, following a Tempest/Cripple combination. It's a good plan against Teemo.

Ugh... Not too good on this champion, oh well, I'll give it a try! Tryndamere I play a lot, so, it's good to get him down and out before he gets that ult! Tryndamere's take crit runes, so it can be possible that you might lose, so I would recommend waiting till you're level three, with all of your abilities, it really helps against a Tryn, your massive damage early game will do well anyways. He isn't always as big of a worry until he has his ult, but if you've gotten fed by then, what's the point of it? You'll kill him anyways, I guarantee it.

Warwick is difficult to solo against sometimes because of his life steal and his ulti. I would recommend getting ganks for Warwick whenever you can, whenever he ults you can use Lee Sin's ultimate, Dragon Rage to get out of it and possibly escape him by Safeguarding to a minion, ally or ward, but most of the time, you can just run, the distance from Dragon's Rage's kick away is enough to run. Buy a Vampiric Scepter but not the Bloodthirster but instead work on Thornmail From there on out, finish your Bloodthirster and continue the build.

Don't get me wrong, she's easy, but beware, she is nothing to mess with early game. Before taking any type of engaging action on trying to kill Lulu wait till you're level 6, after then, she's pretty much at the palm of your hands.

He's quite an easy champion to beat as Lee Sin. Early game. Now, by around later in early game, where he has his ult, he can be a bit of a threat towards you, I recommend getting ganks, or possibly sitting back at turret, do not be too aggressive with this guy. For the same as Warwick, I would recommend getting a Vampiric Scepter before completing Bloodthirster, then getting a Thornmail and if he's really doing that much, suggest getting tanky and going for Giant's Belt then completing Frozen Mallet or Warmog's.

Farming(Danger)

When you're opponent is just too strong for you, I recommend your farming is light hits, coming out of that bush every now and then to hit a minion, or Sonic Wave to last hit minions, from the bush, or at that tower. That is simply it.

Harassment(Danger)

When you're opponent is really offensive, and you cannot take them, to a point where you got to play defense, the way to harass your opponent good is by shooting your Sonic Wave every now and then, but not following up with a Resonating Strike, unless you think you can use that combination then get back with Safeguard. This should have some hefty results of pushing them out of lane.

Farming(General)

Good ol' farming, lower the minion's HP easily by using Tempest then simply feel proud about yourself, as you did so much as press one button, now you're swimming in gold, by hitting every minion once and picking up the last hit, congratulations, this is the way to legitimate farming with Lee Sin.

Harassment(General)

Dude, what are you doing? If you're going to harass, be aggressive as possible! Sonic Wave then use Resonationg Strike! Tempest then use Cripple! Beat them up with auto-attacks, and then when you're ready, finish off with a Dragon's Rage straight to the face! Or simply back off with a Safeguard if you haven't dealt that much damage, or plan to go back in and finish 'em!

In early game, you're really just hyped up, looking for that kill on someone, whoever it is top, encourage yourself, don't be afraid, it's Lee Sin! Harass with that Q! Slow with that E! Jump back with that W or finish with that R, you can be really aggressive with Lee Sin, he has the strength to back it up, I notice when I go top, me having first blood is at least 95% of the time, I always get the kill on top before they manage to kill me, depending on the champion. I'll list out a few combos for you guys to try out, land your Sonic Wave on them, pop that Resonationg Strike, flying to them and kicking 'em in the face! Land that Tempest and slow with Cripple, start hitting them with melee hits a few times, when you think it's good to back up, simply walk away, or go out in style by flying to a minion or ally. It's also very very important that you use his Safeguard a lot while farming minions and or fighting champions for the shield and that extra lifesteal and spellvamp. With Lee Sin, ganking bottom is an option, but I prefer to handle top, if bottom is doing alright that is. Being ganked, well, that isn't usually a problem towards Lee Sin, it's very easy to escape as long as you have some minions nearby, or allies, wards, shrooms, boxes, etc. You can easily Safeguard to them when in danger, it's how I always escape my opponents! This role is mostly the same for mid-game. Except during mid game, you don't have that much of lane phrases, at the same time you still do! So right when you're done looking for that team, or grabbing your buff, get back to that lane, and push! Let them know you're fierce, if you're fed and doing good, it's pretty much good-game there on out. I also would like to take a moment to mention something about Lee Sin's Sonic Wave, depending how you're being chased, you can always use that to escape out of a situation if you do not have anything to Safeguard towards. Sonic Wave red buff, or dragon, something to get out of there.

Well, we all know by late game you're never in-lane that often anymore, more of, with the team, planning a gank, falling into an enemy trap, or being way to greedy and jumping into the team at full force to get that one champion that was really low! But... you didn't kill them. Unfortunately for the other team, Lee Sin did get that kill, and killed the other two as well, and came out with full health. Because, he is Lee Sin, and he can do anything late game! Except not really. If you aren't incredibly fed, make sure you aren't running into too much of a muck. We all get greedy now and then, but try to keep your focus on. Support your team, remember, teamwork is success, stay together late game, don't spread out, Lee Sin can be quite a bit of a carry, so don't worry about a champion hitting you while you're trying to take a turret, unless of course the other two are coming or the whole team is on you. You aren't that strong, but you are pretty strong. Let your team lower them, pick up the kills. You lower them, pick up the kills. Or just do everything yourself! Lee Sin is an obvious amazing 1v1 champion, he's strong enough to possibly 1v2, maybe even 1v3 depending on the team. Here's a good combo for you to try. If your teammates have slowed them, or you have slowed them, etc. stun, slow, or snare, you can walk infront of them, and Dragon's Rage them back to where your teammates are, to take them back from retreating, but to ensure that you aren't letting them get away! Sonic Wave them, then use Dragon's Rage, then following along using Resonationg Strike to follow them after kicking them with that ult. Of course it's also nice to Flash and hit that Tempest/Cripple when your Sonic Wave/Resonationg Strike isn't up just yet, from taking out that other enemy!

Basically I would like to wrap up everything here from fighting to defending. Most important of all Lee Sin's point is to be aggressive, attack as much as you can, harass, get kills, gank when you want, push with your team, and win. The runes really help for durability and giving your opponents a hard time with living. Lee Sin can be a very powerful champion on the offensive side, I take into consideration to get some health items even though I don't have to worry about his defense since he is so strong in general. I'd like to thank you for reading this. Please take your time to comment and leave some feedback, it is always welcome!