Learn to move properly

Unreal Tournament has a very different movement system than other games, while having some movement features that are familiar, but if you don't learn the unreal exclusive movement features you are an easy target and you will die a lot more, hopping and turning won't cut it in Unreal games.

Dodging:

Tap any of your direction buttons 2 times fast and you will quickly hop in that direction. Dodging is vital for moving fast and getting out of the way of enemy fire.

When in a fight, don't just wildly jump up and down, that's called "bunny hopping" it while may feel like you'r doing something that works, but it realy doesn't, at least not against an experienced player.

Learn how fast weapons fire, then anticipate when the weapon that your opponent has can fire next and THEN dodge out of the way. This, of course is not effective against constant fire weapons like the stinger and link gun. Which leads us to the next thing...

Strafing:

Never use your keyboard to turn, use your mouse for that, and bind buttons to left and right strafe. When running, never run in a straight line, get used to allways strafing left/right at random while dodging in an unpredictable manner. That sniper up on a ledge somewhere will have an easy time picking you off, if you just run straight, and you never know when that bullet will take your head off so don't give them any help.

Circle strafing:

Circle strafing is a movement technique that will make you a lot harder to hit. To practice, find a thin pillar somewhere, whip out your Stinger minigun and fire at the piller, now using your strafe left or right buttons move in a circle around the pillar while keeping your aim pointed at the pillar. Once you can do this without thinking, you can move around another player trying to hit you (And missing you) while you'r spraying him full of bullets.

Don't just strafe in one direction, mix it up and be unpredictable, your enemy will be trying to keep his aim trained on you, if you only move in one direction it will make it easier for him to hit you, if you move in all kinds of directions at random you will be a lot harder to kill.