What’s one piece of travel advice you always follow?

I always follow one piece of advice is thar do not talk with any unknown person while traveling between two cities. Do not eat anything given by a stranger while traveling in any government transports including train, bus, and airplane.

Do not frank with any stranger otherwise they take advantage of your kindness and also threats for your life.

So I always or must follow these advices while traveling between two cities in the bus or train or airplane.