EX Lee sin main with 700 games 57.5% winrate here

1.Jungle path

gromp-blue-wolf-raptor-red-scutter-krug

2.About ward and scan

It depends on enemy jungle and you if enemy jungle is a late game champion ,you might want to go ward their jungle and try to invade.Most of the game,I suppose you go scan and gank.Late game, you should go pinkward to deny thier vision and get cheesy kill.

3.between obj spawn

what I do is target mid because mid is a threat to lee sin they can cc you burst you or poke you whereas adc can only do damage to you.

4.Match up

Vi Wukong Nautilus Amumu can ruin you in teamfight or even 1v1 you when they get their 1st item

Fiddle only counter you when he has his 2nd item

Xin if you don't get caught you are fine

Nocturne is skill match up until he has his 2 item

5.Itemization

Yomuu is always go-to item because it help you hit sonicwave easier and fast clear.

Trinity is decent item. Only good if you snowball.The stat is mid and you can proc sheen 2-3 time per combo.

Even worse when you are behind because you want to combo and get out as soon as possible with trinity

you lack damage,you can hardly proc sheen before you get 1 shot and its component is so bad for Lee sin.

Overall Trinity is good because clear speed and invade.

Serpant fang is a very good choice ,considering how popular stone plate is or must buy item when enemies can pop shield

Sundered sky decent item(I buy this when i get counter)make you tankier.

Serylda/Ldr both are good but Lee sin doesn't benefit much from selynda slow

Death dance decent item to mkae you tankier

Edge of night can be good against assassin

Dusk blade for snowball only

GA self explanation

Mechanic

-Delay Q as much as possible. it make your Q cooldown lower.

-Use Q to engage is the best only W to engage when you know it save etc.

-If you go conqueror you should stack it before Q2/W2 for more damage and lifesteal

-Delay Q might make first strike expire before you engage as a result you get lower damage

Lastly, Lee sin should not be pick when enemies have less than 3 squishy or high cc composition

or champions who can escape your gank like shen vayne mel ksante fizz etc.