Simple, a thread which begs to give tactics, techniques, and various methods of ridding and using armor.
My basic personal tactics:
Always shoot the the flattest part/side/rear. For example, the gears and togs in the tracks on the side of a tank, or the side armor on a Panther. The problem with killing panthers is the sides are the only real vulnerable spot, as the rear is slanted as is the front and everywhere except the sides.
If you see a mineflag, never follow that route or run over the mineflag. This should be pretty obvious, is detailed in the FH2 training videos, and in general is common sense. I however find that many people like to runover mines even when warned of with flags.
Always keep AP loaded (in tanks)
This way, you are prepared to engage anything. If a tank pops out of nowhere, you can nail him. If infantry come out, most tanks (excluding Stug) have a ready coaxial machine gun. If you load the special rounds (HEAT/HVAP, unless default round) you'll waste 1 of 3 rounds already next time you see something.
Don't expose your flanks
Simple, just don't. Its obvious because your flanks allow you to be instantly killed.
Opinions of the above and your tactics below. I know the above are obvious, but I feel that however obvious the mine flag one was needed. I hope you guys can think of far, FAR better tactics.