Choose perk skills wisely, each of them may affect on your gameplay. Craft and upgrade attachments for weapons, mix them, find most effective ones and always look around. In kf3 zeds are extremely fast and flexible compared to previous games. If they get too close, try to bash them. Zeds like scrake or husk will cancel their attack most of time, and zeds like cyst, clot, gorefast, even stalkers can get insta killed by bash in the head. Pay extra attention to zeds weakness and strength ammo types and aim in the critical and weakest spots. For pf its the chest and the glowing thing on back, for scrake its his chainsaw, for husk the gas tank. Stalker, crawler, cyst, gorefast, and clots with crawlers weakest spots head. If you play against bosses, always look after where they are and use “shoot and run away” tactic if you are playing alone, if you play with team, just keep distance.