In this guide I will go over each class, what they are good for, and how to kill them easily

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Let's start with the Scout

The Scout has one great ability, it's fast capture rate, and it's speed. Use the scout to your advantage when you are in need of a win and time is short. He is quick to get away from enemies, and does some nice damage against spies. You can kill a scout easily by simply burning them with a pyro, or setting up a sentry gun while your engineer.
The Soldier:
The Soldier has also one great ability, high damage rate. The soldier can do a lot of damage. Shoot your rocket at the ground when all the enemies are gathered around the capture point, you will get tons of kills, at least 3 or more. You can also use the Solider to rocket jump to get places faster. The easiest way to kill them is by using a spy and backstabbing, or using the sniper's secondary weapon.
The Pyro:

The Pyro's great ability is the use of one fire hit and just run away. It is an easy kill and puts you at less risk. However they are very vurnabile to Sentry's and don't have a good range. Use a shotgun or any other weapon to kill them.
Demonman:
Plain out sucks.
Heavy:
Sucks balls, serious low damage, do not use.
Engineer:

Engineer's are great for their teleports, dispenser's and sentrys. Play an engineer if you want easy point's and kills. Set up a sentry, teleporter, and dispenser and your set. Use a soldier to kill them off easy.
Medic:

Great for ubercharge, use for easy points, great gun. Take a pyro and they are dead.
Sniper:

The sniper is great if your looking to get some easy headshot's. They are easy one shot kills, they also have an automatic secondary which is nice for kills too. Very Vurnable to any class.
Spy:

By far the shittiest, and my favorite class. The spy is great for sneaking behind emeny lines, and killing them. Act normal. Then when appropriate. Backstab and fade away using your Electro-sapper. Easy to kill with engineer's sentry as it detect's you most of the time if your not in disguise or you backstab an engineer.
Thanks for reading!