Hi all, this is my second guide. I made it about Tryndamere, one of my favorite champions.
Everything will be explained here!
Good luck playing with Tryndamere! (oh that rhymes)

PS: When improvements are possible, please inform me and I will try to change it :)

For the first Tryndamere (Spinner), I used a lot of critical chance runes, this because for every critical strike made with Tryndamere's Spinning Slash, the cooldown is reduced.

For the second Tryndamere (AD-AS), I used a lot of attack speed runes, because he mainly uses basic attacks anyway. You can kill and farm easily with high AD and AS!

Both Tryndameres have the same masteries, just because I think these are the main melee masteries. I picked a mastery to boost Exhaust and Ignite, and a mastery to boost heal. According to me, that is the best mastery build.

Tryndamere 1:
Starting with Boots for just that extra movement speed. Then I take the Berserker's Greaves for my attack speed and more movement speed. After that I buy the Infinity Edge, if you can't afford it immediately: BUY THE Cloak of Agility FIRST, you desperately need that critical strike chance. After that I but the Deathfire Grasp, because 100% of your AP is added to your spinning slash's damage, so that is really useful. You might think: "Why that item, there are other AP items too?"
I took this item because other items (almost) always add mana, and that is just wasted money for Tryndamere. Then buy Bloodthirster, for extra life steal, this is really convenient when you farm a lot. Then buy Black Cleaver, for extra damage and attack speed, always convenient. Then I just added a Stinger, then build it into a Nashor's Toothpick, but most of the time the game has finished by now if you have a good team ;) .

Tryndamere 2:
I start with the same old Berserker's Greaves, but then, I get Wriggle's Lantern, because of the Active and life steal. It is also convenient for farming, because it has a 20% chance to deal 425 magical damage to a monster. Then I get the Infinity Edge again, this is a signature item for Tryndamere, a build almost can't do without it. Then I get a Malady, for extra AP and AS, I don't like Phantom Dancer, don't know why. (lol)
Then I get Bloodthirster, or a Lich Bane, sometimes I want the Lich Bane first, but sometimes Bloodthirster, depends on the situation. Now get a Stinger, after that, build it into a Nashor's Toothpick. Then take a Lich Bane, Lich Bane is very useful, for example, when you use your Mocking Shout, Spinning Slash, Bloodlust or Undying Rage, your next attack will do +100% of your AP damage, which is very nice!

Tryndamere 1:

I am maxing Spinning Slash at level 10, but if you want, you can max it at level 9. I did it at level 10 because I like to upgrade Mocking Shout for a slowing effect when they escape. As usual, upgrade your ultimate at level 6, 11 and 16.

Tryndamere 2:

I am maxing Bloodlust at level 10, but you can also max this one at level 9. But again, I want to upgrade Mocking Shout. This ability is very useful. Also upgrade your ultimate at the usual levels 6, 11 and 16.

Tryndamere 1:

I selected Teleport and Ignite.
Ignite is always useful to do that last hit, and Teleport (I solo top) is useful for getting back to your lane quickly!

Tryndamere 2:

I selected Exhaust and Ignite.
Ignite again for that last hit, and exhaust for slow, this is very useful, especially when your enemies aren't turned with their back.....

Tryndamere 1:
Pros

High Damage with basic attacks
High Critical strike chance
High Critical strike damage
High Attack speed
High Damage with

Spinning Slash
High Farming Ability


Cons

Vulnerable to Crowd Control
Hard to fight tanky champions

Tryndamere 2:

High Damage with basic attacks
High Critical strike chance
High Critical strike damage
High Attack speed
High Powning Rate :P

Cons

Vulnerable to Crowd Control
Hard to fight tanky champions

I advise this, but only when you are duo laning. First you can put your Wriggle's Lantern (with Tryndamere 2) somewhere, for a sight ward. Then go in the bushes and wait for an enemy to come. When an enemy arrives, jump in with Spinning Slash and just use your basic attacks, then, when they try to escape, use either Exhaust or Mocking Shout. When they are too far to hit with a basic attack, use ignite to finish them.

As Tryndamere is a carry, teamwork isn't necesary, but possible. You can help out teammates when they are on low health by attacking the enemy, but I don't know any other way. If you do, please inform me ;)

The good thing about Tryndamere is that he doesn't need to use abilities to do high damage,

Farming is easy, because Tryndamere will reach a high AD, which makes it easy to kill minions. Most of the time, you can 1-hit them. This will be easy. You can also dive in with Spinning Slash when there are loads of minions close to eachother.