Hello, I'm silver player and my name in game is oXGreenFighter
This guide is for Master Yi the best champions in low Elo, but he need some skills in high Elo
And I love Master Yi cause he has a lot of Movement speed by ultimate Attack speed and very easy to play

Marks

AD Cause you are AD Champion and your abilities scales with AD

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Seals

To survive vs AD Champions and in jungle

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Glyph

3 MR to survive vs AP Champions and CDR per level cause Yi had long cd abilities

Fleet of Foot

For some movement speed, And to start with 360 instead of 355

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Tough Skin

You need it to survive in jungle

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Core Items

Best item for Yi, you must have it on every game! it's given attack speed and some life steal with good slows.

Another good item for Yi, It's given you CDR and it's passive given you some ArPen, And it's active just like your Ultimate, You can sell it on late and get some armor if you need.

It's the best item vs tanks, If you saw the enemy team got a lot of armor then get this item.

Q - It's very amazing skill in Yi, You can use it to avoid enemies by ward and Q Frog, Golems, etc
W - You can use it while getting some damage from enemies or turret
E - Passive: Give you more damage Active: Give you true damage
R - It's Yi op skill you can run from enemies, More Attack Speed, And destroy turret faster!

Pros

High damage
Fast clear
Escapes easy by ultimate
True damage from E
Can survive if dived by W

Cons

Squishy
Can be easily killed if stunned, silenced
No CC
Red Buff dependent
Need FARM!
Needs items to do damage

Jungling paths

Blue side start
Golems [Smite him], Red, Chickens, Recall and then buy first recall item
Frog [Smite him], Blue, Wolfs, then do ganks or farm

Red side start
Frog [Smite him], Blue, Wolfs, Recall and then buy first recall item
Golems [Smite him], Red, Chickens, then do ganks or farm

You need to know when to use your Q and W, not at any time, and here are some examples for when to use Q
Aatrox Q
All Ahri abilities
Alistar Q and W
Ashe ultimate
All Lux abilities
Jax E
And mush more!

Farm, farm, farm!
Master Yi needs a lot of farms to get core items as soon as possible.
And get stacks for Devourer to do more damage.

I see, you reached the end of my guide I hope you tell me my English mistakes to learn from my mistakes.