Hey everybody, welcome to my Akali Guide,
this is my first guide, hence don't be too critical on it. Anyways, I'd like some feedback non the less.

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Less talking; let's get started before this gets too long to read:
Playing Akali with this guide will definetely make you rule, promised. Games like 24/2/6 won't be very unique if you do it right.

The Reason why I picked the runes ^above is simple: we want to get 10AP really quick to enable the damage buff (as we got 10AP from our base item already both buffs will then be active). See Twin Disciplines!
All the other runes have one plain purpose: damage dealing.

Not much to say about them, you really have to find your own preferences there.
I personally like them as they are, as they give some base defenses, evasion rate & of course damage. Plus mastering Ignite is a good thing on akali, as you can make great use of the 10AP.

The experience Bonus is very good for jungling by the way, as then, you can start by killing the golems and will gain a level up already. Anyways, as I said already: akali's masteries are all about your own preferences.

You will start off purchasing a Long Sword in order to gain the Lifesteal Bonus, afterwards, you'll be upgrading your LS to a Sword of the Occult, which you should purchase before leveling up to level 6 (as then, you will start ganking & need to get stacks up - as soon as you get a few stacks you will have the potential to kill nearly everybody).
Anyways, as next you'll purchase Boots. Note that you shouldn't upgrade them, yet, as you urgently need the Money to purchase the next item: Sheen. It will come in very handy if you have a plenty of stacks already, as it will make you deal lots of extra damage.
After purchasing that, you'll upgrade your Boots. Now, you'll pretty much have to find out yourself what boots to purchase; you should make that dependant on whom you play against. Usually, Mercury's Treads are a good choice on akali.
The next thing you should purchase is Rylai's Crystal Scepter. What item you purchase first of it should be dependant on if you die too easily, still, or deal too little damage.
After having purchased Rylai's you should try getting the Needlessly Large Rod, of whom you will build Rabadon's Deathcap as soon as possible. Once purchased, you should upgrade Sheen to Lich Bane, which will boost your amount of AP Damage output enormously, and definetely make you unkillable. Note that you should never purchase LB before your AP tops your AD, as else you will deal more damage on Sheen.
Eventually you'll purchase either the Hextech Gunblade or a Guardian Angel, depending on your opponents.

Hence, your Final Items should look somewhat like this:
Sword of the Occult
Mercury's Treads
Lich Bane
Rylai's Crystal Scepter
Rabadon's Deathcap
Hextech Gunblade

Akali's Skills usually should be used as follows:

Q = Mark of the Assassin
W = Twilight Shroud
E = Crescent Slash
R = Shadow Dance

Q -> R -> W -> Auto Hit -> E -> Q -> R -> Auto Hit...

Though, you should absolutely account for always having one essence for Shadow Dance available, as it helps you at 1) killing heroes when they run 2) get away if you get ganked (...unless there are no creeps around you).

Also, note that if in worst case an enemy has purchased a Banshee's Veil (which is the best item against akali imho), you should start with R -> E in order to remove Banshee's protection and then start your usual combo, as else you will die to whoever carries banshee's.

Akali's summoner spells should always be Flash & Ignite. Always.
Flash immensely helps you getting away (if you are ganked, run near a terrain, cast W around you to slow your opponents plus stealth yourself & flash through the terrain) while Ignite will always be a good backup to get a kill (which then again is important for your stacks & lifesteal).

You should definetely stay passive until Level 3, means, use your Q skill to get some creeps and just stay back at any other times (except for ganking). Once you hit level 3 you should have unlocked your very abilities (except for your ultimate) and can start getting more active.
The tactic here is to get your opponents off the creeps and hence deny their money. You can do so by casting your W skill right into the creep-fight, then run into it, stay in there a while. Now, use your Q -> Auto Hit Combo to damage your opponent. He will probably leave, if not, get stealthed again and repeat. Once you frightened him away you'll just farm all creeps using your E skill and Q skill to last hit. That should usually give you quite a good advantage adverse your opponents.
As soon as you turn level 6 you should start ganking, which is pretty easy on akali. Get hidden in a bush, Flash forward to be in range to use your Q skill (if in range already then don't waste Flash) and then use W to slow your opponent. You should drop his HP very quickly, if you remember the Skill Sequence. :P
Yet again, I can only repeat: Always make sure to have at last one charge for Shadow Dance ready in order to either flee from or kill an enemy champion.
However, it is never a waste to use your ultimate to dash onto a monster, if you then are capable of dashing to an enemy champion that you can eliminate.

Akali can jungle, is quite a quite uncommon jungler, though.
Basically, she jungles like every other hero, start at the two Golems, get the red buff & just randomly creep everywhere until you're level 6 and ready to gank.

Not much left to say except that you WILL have difficulty playing akali at the beginning; don't be frustrated, though, you'll get into it, and once you do you will rule. Promised.

I will also be updating this guide from time to time, so keep checking it & leave your comments & thoughts below. :)

-DeathsEffigy