Resident Evil 3 does a great job of keeping you focused on what’s in front of you only to have a zombie or two sneak up from behind. Give it a slash from your knife or a shot in the head (if you have the ammo to spare) and if it doesn’t move or get up, you’re safe.
If you see a dead body that doesn’t reanimate when you walk by it, don’t assume it won’t do so later. Many of the zombies you can avoid you can actually brush right past, as long as they aren't facing you. Many rooms have zombies that just get off the ground as you approach. Zombies won't attack during their 'getting up' animations.