This is my first guide that i have ever done and i decided to start on Master Yi. Personally i think Yi is one of the best and perhaps easiest hero to play, with great burst damage capable to actully one-hit spellcaster you can easily carry the team on your back.

Pros:
Amazing burst damage
Ulti can be use to escape as well as bursting down your chasers
capable to jungle and lane with ease

Cons:
Very squishy
Likely to be the first to be the target
Exhaust and blind pretty much makes you useless
Thornmail....

The first two is easy to avoid, just dont be greedy and wait for your chance
Exhaust and blind all you need to do is either run away with ulti or counter with your own exhaust.
And lastly thornmail, not much to do about this iteam usually i just avoid the guy with this item and let the rest on my team take him down but depending on the target hp and dps it might be possible to burst him down with your lifesteal.

Double Strike - Master Yi strikes twice every 7th attack.
Dubble strike is among the best skill toward getting first blood, just make sure you stack up to dubble strike on the creeps and use it with wuju on the enemy hero. If you get lucky and get a crit from the runes this will easily be a kill unless you mess up
Alpha Strike - Master Yi leaps across the battlefield striking up to 4 enemies, dealing magic damage to each enemy with a chance to deal 400 bonus magic damage to minions.
Alpha Strike is a very good early game ability, allowing you to teleport to and from the target. however it will drain your mana FAST so make sure that you take the manabuff quick and you'll be free to spam it however you wish.
Meditate - Master Yi channels, restoring health over 5 seconds. While channeling, Master Yi gains armor and magic resistance.
Mediate is accordingly to me a very useless spell since it render you a sitting duck during either a chase or teamfight and the only time i would consider spending a point in this early game would be if the other team had Karthus

Wuju Style - Passive: Increases physical damage. Active: Master Yi can activate this ability to double its effectiveness for 10 seconds, but this removes the passive bonus until Wuju Style becomes available again.
Well what can i say about this spell, bonus damage? Loving it! just make sure to use it with your ulti and you can pretty much take any hero

Highlander - Increases Master Yi's movement speed and Attack Speed, becoming immune to all slowing effects. Additionally, killing a champion refreshes all of Master Yi's cooldowns, and scoring an assist reduce the cooldowns by half.
Highlander, this is your bread and butter in the game. This is what will keep you alive and the enemy dead. When you use this spell to gank it's very important that you kill the enemy before the ulti run out cause if you get a kill during the ulti all your spells cd is refreshed, giving you a new ulti to either take the other guy or run away safely.

Ok the whole ide with this guide is that you'll need the ulti to hit and run. Bursting down the enemy within seconds and then moving out. You're never the first to engage in a fight unless they're alone or low on hp. Reason why is because Yi is a very squishy hero and always the target of ganks because of it, even more so if you have been feeded.

Wait for the other team to pick a target before entering team fights otherwise you'll be dead before you know what happened.

What's "speciell" about my guide is that it allowes you to burst down the enemy within seconds with 1,2k crits rending you a lethal weapon.