So what are some of your best tips for noobs?
Here's a couple tips when you're playing against someone of the same class.
One of my biggest tips is "Shoot first". If you don't shoot first, you will probably lose. Unless it gives your team some strategic advantage (i.e. you're in the courtyard and a scout is running up the straight stairs with enemy intel), you should probably retreat.
Another one is "Numbers always win". If I'm up against a Heavy and we both have full health, a engineer on the other side of the map shooting his SG will greatly tip the scale in my favor.
Strategy:
TF2 can be a thinking man's game if your aim sucks. Don't get caught up in aim contests. Learn to be decisive, if you see a flank open up, take it. I get a lot of kills off of guys who try to flank but aren't decisive enough, so when they get into position they don't know I've already flanked THEM.
I like to cut 2fort4 into 3 groups. Offense, Defense, Center. Generally, your best player is going to be offense, with a medic behind him. Your Defense is going to be an engineer or two. Then in the Center are the guys who either pull back if you are under attack, or push forward if a hole has opened up. If you re playing Center (this includes you, snipers) and someone picks up the intel. You should pull back and go for the stop if you are on YOUR side of the bridge. (especially snipers who sit on the deck).
Communicate! There is a little arrow at the bottom of your screen that says which way the intel is going. use it! Tell people which way the intel is going if the enemy has it. If you have enemy intel, tell people which way you are taking it. (Generally its a good idea to take it the same way you got in, unless someone says otherwise). If its dropped, let people know where it is. The living can NOT hear the dead talk or type!
Engineers: Don't give your life for your sentry gun. If an uber comes in and wrecks it, let them (unless its just a heavy or soldier where you can repair them faster than they can damage you). Then when they go downstairs just start rebuilding. They come out with the intel and run right back into the rebuilt sentry gun.
Spawn camping is a strategy, no QQ. And change class if you're being spawn camped so you can start pushing back.