A tougher technique to master will have you avoiding zombies without wasting bullets at all. Learning how to dodge and manoeuvre enemies is a fairly high level skill, but if you look out for some telltale signs, you'll be breezing by them with ease. Firstly, in which direction is their body moving? If they're moving from side to side in a corridor, you'll be able to accurately predict their next move. So, when they turn away from the angle at which you want to take, quickly run around behind their back.
Next, you can also predict their moves from which way their head is facing. The nasty set of teeth is what's going to deal the damage, so if they're not looking at you, they can't do anything about your presence. If one is slowly stumbling towards you, pay attention to that noggin. If it's looking left while you want to go right, you should be able to carefully move beside it without a scratch.