I check the laws of the area before I go there. I also see what people on the Internet are saying to get a little "street knowledge". I can get a general sense of a place if they have silly laws like, "A permit is required for possessing a steak knife outside of a restaurant." I made that up, but you get the idea. If I see a law like that, I'll carry one of my wimpiest knives if I carry at all. It has a 1.75" blade and requires two hands to open.

Outside of clear laws, I follow the general rule of being discrete and carrying a non-tactical gentleman's knife/tool.

Anyway, the original question is super broad. For anybody who answers for their country, somebody else can give 10 caveats to the answer. The USA doesn't even have consistent knife laws among the states. The states don't even have consistent knife laws among the counties. So, I travel with the notion that every country does not have consistent knife laws throughout their entire country.