This is my first ever guide hope you will like it and will help you!

Feel free to ask anything what you want to know I can probably answer to it!

Btw make sure you read all the notes near the items!

Early game: In early game Lee Sin has really big dmg and he also has high mobility with mobility boots and sightstone so ganking with him not that hard! Roam a lot with Lee in early! Don't start the gank with using Q because if you hit and jump there he can easily escape with a flash or some other jumps! So be sure the lane at least half pushed so you can ward jump near him or minion jump or wahtever jump just do it with w and when he flashes or jumpes you can hit your Q on him and catch him!

Late game: In late Lee Sin's damage will be pretty low so in teamfights you won't be able to 1 shot a carry but you will be still usefull if you start the fight with a great combo! What do I mean under a great combo, well I mean kicking back somone from the enemy team. (usually do this with the carry) So you can do this several way, but the best is wardjumping behind them or flashing! What will happen if you do this? Well, the thing is that 1 member of the enemy team gonna be kicked out and will be alone so your team can get an easy kill on one of the carries or who you kick, so basicly it's going to be a 4v5 and (without a carry from enemy team) and a 4v5 teamfight usually not gonna be that hard because one of the damage dealers gone from enemy team! What will happen to you if you do this? So, your not gonna be that far away from your team you do have a little tankiness when you kick someone back make sure you can jump with him or follow him after a few secs! Even if you gonna die the trade will be worth because you are not the damagee dealer in the team and your team can easily kill the other 4 memeber!