I've been stuck in mastery lv6 for a while and got only 1 lv 7 token as 
. I wish someone can give me some tips for jungling routes, builds, and engaging.
this the build I'm using now ( by order)
1.
2. 
please instruct me more! Senpais!
5050BS2 votesIts and its BROKEN double for melee crap.
He gets this FIRST item and mops the floor with vs anyone. EVEN if he has been feeding.
SeAn DoDsOn1 votesMaybe I should take BORK before phantom dancer.
DorkunedAuras1 votesIgnore what this guy says. It's certainly a strong item, but the "double for melee" thing was a brief PBE change that is not currently reflected in the live game.
DorkunedAuras1 votesIt's the same for ranged and melee atm. Those were changes only on the PBE that have been partially reverted.
Contagion871 votesPress Q moar.
I guess you do not need boots.
*Your build order should differ based on the game. ( Your opponents team comp, their build order vs yours, how far ahead/behind you are)
There is no such thing as having a set build order unless you choose to. Also, both builds I see are interesting and different from how I build him. I generally do not get rageblade as I expect people to die within 1 or 2 q's. I would incorporate ghostblade for extra lethality, cdr and damage. For armor, I would get frozen heart if they are attack speed based and for the cdr, or I would get guardian angel as you have. For HP, you can get steraks gage for the AD and shield. For lifesteal, bork is great. Phantom dancer is nice if you are ahead. Otherwise, I would get statik shiv for clear to farm. IE is okay if you can build it quick enough, otherwise more attack speed or more tank at that point for extra surv.
This is just scenario based. League is scenario based. If you want to win, that is just how you have to adjust. Die less, kill more, farm more, ward more and the S will come. The key to Yi, is to Q. So attack speed and lethality make senses early game.
SeAn DoDsOn1 votesThanks a lot I will be trying to build according to the situation
Starcraft243ver1 votesVS Team with full squishies :
-> -> 
-> 
, sell jungler item if hard cc you can't dodge :
else
If you are really full build : 
(for cdr ms and some hp, or a black cleaver).
Vs tanky teams :
You can also build full lethality, but it's really not as good as these 2 others builds in late game.
The key with yi is to get 3 items and your boots, and then you can probably 1v2 quite easily, then you proceed to just splitpush and flank the teamfights.
If they come for you when splitpushing, based on how fed you are and their cd/cc available, you might want to fight, or run away. If they come one by one you can penta quite easily, if they are 3 or more, it's going to be hard. If they are 2, instant the carry and it should be okay. (R - red smite - Q - E - W to reset)
SeAn DoDsOn1 votestks a lot the combo is great
Volphi1 votes[deleted]
SeAn DoDsOn1 votesI see, maybe I shouldn't rush into every teamfight.[zombie-brand-facepalm]
Volphi1 votes[deleted]
SeAn DoDsOn1 votesI know, Yi mid is really really terrible and you're basically dead every time u get stunned in teamfights
SeAn DoDsOn1 votesBy the way, any good jungle streamer?. Not Nightblue cuz he plays a lot of off meta games
Starcraft243ver1 votesI would never take a 4th AS item after jungler item + botrk + guinsoo, as the AS is wasted.
Volphi1 votes[deleted]
SeAn DoDsOn1 votesDo you recommend building a bit crit on Yi? or just tanky lifesteal
Volphi1 votes[deleted]
SeAn DoDsOn1 votesU get deleted when you get stunned when you build full crit
Starcraft243ver1 votesNearly any other defensive option grants more damage reduction than phd as a 4th item. Wasting the AS on an item having half his stats being as is not the smartest move from my pov.
SeAn DoDsOn1 votesI see
l Dárius l1 votesyeah guys who wants boots on 2017 amirte huehuehuehue
SeAn DoDsOn1 votes...
no to toxic1 votesYou should try getting a more tanky build in situations where you need survivbility more then dmg
(the jungl AS item) 
(optional)
It may not be very tank and the Titanic Hydra isnt actually needed but it saves lives
Sasogwa1 votesDon't go for in a build. It's not worth it. Tanky or off/def items are way stronger because you need to survive enough to get the rageblade stacked
SeAn DoDsOn1 votesok