Don't meet your alter ego, it's just a recipe for disaster.
When visiting different timelines, always bring a gift, like a nice bottle of wine or a decent pair of socks.
Respect local customs and traditions, unless they're really annoying.
Never travel back in time to a era before the invention of the toilet, trust us, it's a real pain.
When encountering historical figures, be polite, but don't be too familiar, unless you're really sure you can handle the consequences.
Rule 1: No time-traveling for fun, it's just not worth it.
Rule 2: Don't bring a selfie stick, we've all seen enough.
Rule 3: No time-traveling for fame, unless you're really, really sure you're ready for it.
Rule 4: Don't eat the local delicacies, trust us, you don't want to.