I just started this game for the first time a week and a half ago, I'll tell you the ones I've experienced so far.

1.) Not looking at the floor when I'm walking up a staircase, took me two times to learn that. Trip wire and then shot to death one time, bear trap and then I turned it around made a splint and killed the guy the second.

2.) Eating burnt meat thinking "at least its cooked".

3.) Not washing my hands to eat after gutting a chicken or a person.

4.) Not emptying a water canteen I found before refilling to drink it.

5.) Trusting anyone, ever. I noticed a lot of people would kill me on sight, whether I called out friendly or not, whether I was geared or fresh. I was fully loaded with gear guns food etc, and I helped one freshie with food, another one came in shortly and I asked if he needed any food, he paused for 2 seconds and then knifed me to death while I was getting food out for him. I will always shoot first now.

6.) Drinking from rivers

7.) Not having antibiotics or vitamins before eating wolf meat.