Rule #1: Never, under any circumstances, should you answer a distress signal. I know, I know - the Company says they won't pay you if you receive a distress signal and don't answer it, but I ask you - would you rather forfeit this one paycheck or have an intimate encounter with a Facehugger? Still don't believe me? Check out "Sunshine."
Rule #2: Do NOT split up. You will not cover more ground - you will get eaten. When has splitting up ever resulted in less people dying, guys? Seriously.
Rule #4: Computers are not to be trusted. They think they know what's best. HAL, Ash, VIKI - there are plenty of examples. If you give machines an inch, they're gonna take a mile.
Rule #5: No, you do not want that important specimen. Yeah, it's ugly and has an evil look in its eye (or maybe, as far as you can tell, it has no eyes), but you're gonna thaw it out or transport it home in the name of
Rule #6: Monsters have special abilities, like infrared vision or extraordinary hearing. Look, it hasn't survived natural selection this long to be defeated by you, you puny human with excellent color vision and the mental faculty of logic! Watch out for enemies that can hear you run on dirt, see your body heat, and of course, smell your fear. :)
Rule #7: You'd best learn to operate some heavy machinery. Whether you know how to repair the hyperdrive on a clunky old unreliable space craft or you've been certified to drive a cargo loader, you never know when this kind of thing might come in handy.
Rule #8: You might be dreaming, so there's that. Although, from what I hear, sometimes you wake up to another dream.
Rule #10: "Life, uh...finds a way." As Dr. Ian Malcolm so eloquently put it, life just finds a way. No matter how small the odds that those monstrous creatures of science fiction will get the upper hand, it's a crazy universe we live in, and you can't be too careful. Unfortunately, you're a character in a sci-fi movie, so careful isn't exactly your middle name. But thanks for the thrills, the jump-scares, and last but not least, your heroism (or at least your last minute-attempt at becoming an olympic sprinter.)