Hi,This guide is gonna be short and sweet.Primary Purpose is to teach you the art of mastering Lee Sin, and how you can utilise him to the fullness. I'm HGK from SEA server, as you can see SEA has plenty of good Lee Sin players such as SGS.Harleluyar. This guide is a personal one,so I hope you can give me some feedbacks. Nonetheless, let's get started!

Pros
1.Mobile
2.Safe pick
3.Strong early game
4.Able to dish out damage and escape easily


Cons
1.Damage falls off a bit during late game
2.He is a monk
3.And he is BLIND
4.You be experienced in him to play him well
5.Not really easy to catch up if you have a bad start

The runes I've chosen are standard AD TOP runes.

MARK and Quints:Gives you an advantage by having high early damage
Seals and Glpyhs: Allow you to be able to trade with the Opponent regardless him being an AP caster or AD caster

FlurryThis is a really good passive which allows you to increase your attack speed for a short moment and gain back energy

Sonic Wave / Resonating StrikeThis is your bread and butter skill and you should max it first.It is a really good skill for harrassment and making plays. Tip:You may Q to a minion or a jungle camp to make escapes and lengthen the distance between you and your opponent.

Safeguard / Iron WillThis is another awesome 2 part skill. The first part allow you to jump to a ward/minion/an ally champion. This makes a good escape skill. The second part is iron will, which increases your lifesteal. Since this ability ain't that useful as a agressor, I prefer to max it last

Tempest / CrippleYour second skill which you should max. This skill serve as an Exhaust, which you can use to slow enemies or farm a large minion wave.

Dragon's RageThis is your ultimate.You should max it whenever you can.Tips: You can use this skill to last hit an opponent, or stop a channelling ulti such as Katarina's ultimate.\

In a 1v1: Sonic Wave / Resonating Strike> Sonic Wave / Resonating Strike> Safeguard / Iron Will> Tempest / Cripple> Tempest / Cripple> Sonic Wave / Resonating Strike> Dragon's Rage> Sonic Wave / Resonating Strike

Ignite This is a really good spell you should take.
Flash A-must have spell for a Leesin

Other alternatives:

Barrier This is a great spell for escape mechanisms

Ghost Another good escape spell

Boots4x Health Potion This is a really safe start if you are afraid of having to go back to base to heal up

Doran's Blade Health PotionThis is a slightly agressive start, never start with this unless you know how to manage your skills well


Core: Mobility Boots The Brutalizer PhageThis is your 3 most important items that you should get. This will give you enough damage and make you snowball your lane well

Mid game
Trinity ForceThis is a really good item for LS.The sheen passive enhances LeeSins's Sonic Wave / Resonating Strike and the zeal fits well with lee sin's passive. Phage also gives Lee a even better chasing ability and also gives extra damage and health

Black CleaverSo you may be asking, I have never seen a Lee build BC, most of the build lastwhisper. The reason I prefer this item is because I feel that this item has made Lee a better 1v1 champion than Last Whisper. Unless the opponent stacks alot of armor, last whisper would be a better choice


End game build

Ravenous HydraThis is an item which most lee sins would get. The reason behind it is that it gives you a good farming capabilty and allows you to farm very well with your Tempest / Cripple

Randuin's OmenThis is an awesome item! Not only it gives you armor and health,it allows you to utilise his passive and make escapes.This item also makes him a better duelist as it decrease enemy's attack speed

Banshee's VeilWHY? And why not spirit visage? This item gives a really got passive, it has a shield to block global ultis or any enemy skills,which is able to let you be mobile and run away from danger.Furthermore, it gives considerably well HP and MR.

Other honorable mentions:
Blade of the Ruined KingGreat item
Maw of MalmortiusGreat passive
Atma's ImpalerGIves your armor and Ad based on your hp
Warmog's ArmorMore health
Frozen Mallet
Last Whisper
Spirit Visage Works well with your W but not the best item
Ruby Sightstone Not a really good item because of the new trinket, still viable anyway

Your Tempest / Cripple is a really great farming skill, do remember to use your Ravenous Hydra to clear minion waves

Early Game

During early game, you should try your best to harass the opponent and also use W to prevent the enemy from using basic attacks om you.Ask your jungle for an early gank so that you can snowball your lane


Mid Game

This is where LEESIN shines.He is exceptionally pain and you should roam through other lanes to assist them


Late Game

This is where LEESIN starts to fall,his damage starts to fall a little.Rest assured,work well together with your team and it would be a no problem for you.

Safeguard / Iron Will You can use this skill to jump to a sight ward(ward jumping), an ally champion,ally minion

Sonic Wave / Resonating Strike This skill can be used to jump over to baron pit,jungle camp,enemy minion,enemy champion

Dragon's Rage This skill is able to kick your enemy away or even kick your enemy across the wall so that you can escape easily

Thank you for reading this guide, I sincerely hope you would enjoy it. Pardon me for the lack of pictures, I would update it soon. Hope you are able to master this AWESOME champion! Cheers!