Counter-Strike is based strongly upon the fact that one bullet can and will kill you. Strategy is what wins the round.
STRAFE!!!!!!!!!!!!!! - Strafing is very important. Unlike older games, moving to strafing has designated keys. This allows you to evade fire more easily and to be more prepared when attacking. JUMP!!!!!!!!!!!!!!!! - Jumping is also another key manuever. climbing on boxes and other obstacles can give you better cover and a better view of the enemy. Be careful not to jump when running away. When you land on the ground, you will slow down for a second before returning to full movement speed. Also be careful not to jump off of high structures and hurt yourself. Knife - When using the knife, you travel much faster. Just be sure to switch back to your primary weapon at the sight of an enemy. The secondary fire is VERY effective if you can get close enough. Rate Of Fire (ROF) - The ROF of a weappon is very important. Make sure you know how bullets you're going to be throwing at your opponent. Plus, when holding down the trigger, guns quickly become inaccurate. Fire in short controlled bursts, especially with the higher-power guns. Ducking - VERY IMPORTANT!!!!!!!! Ducking makes you smaller while making your shots a lot more accurate. Very effective with high power weapons like the machine gun or the commando. If you jump and duck while in the air, you can also get on top of bigger boxes. Secondary Weapon - Carrying a good pistol is important, especially for snipers. When your primary weapon runs out of ammo, are you going to wait for it to reload? Hell NO!!! Whip out that handgun and dish out some more lead. I recommend the desert eagle. It has the same power as the G3 sniper rifle at a close range. The Sig P228 is also a nice balance of power, clip size and accuracy. Flashbangs and Grenades - These accesories can mean their life or yours. If effectively used, you can substantially lower an opponents health and gain a much needed advantage. Flashbangs are also good for blinding opponents who don't expect you to rush. If they can't see, they don't know where you are, which means they can't shoot you. Smoke grenades can be used to provide cover when rushing through an area. If the snipers can't see you, what are they going to hit? Throw a smoke grenade in their direction, then go the other way and come up behind them.