Can someone tell me waht empier is better the other rases are. IF there is nothing tell me what they are good at..

Empire is fairly average at everything, so they're not better at anything than every other race. They do have solid knights, loads of flexible infantry, the ability to use all eight of the common lores of magic, and they have warmchines. Some could argue that they have the best warmachines (many of those people will say steamtank, a device so powerful it's evil). They are just a really flexible army that has average stats all-around.

I'd say they are just flexible. You could have a solid line of knights, to a bunch of handgunners, to a massive amount of foot troops.

Yup Empire are the *average* army of the Warhammer world, and are quite good vs all other armies
They have the ace detachments rule which really gives them a nice trait
They also have the steam tank which many consider to be slighty too overpowered for them, just be prepared for the opponent to cry cheese if u ever use 1