If I want to do business Are there any rules I should know like Don't do business in the Khanate cause the city shifts too much etc? Like should I invest a lot in one town, a little everywhere, only start investing when I own a town? any tips like that?
You can only have 1 business per town, and the start up fee is the same each time, after which there's no significant additions to it. So the best (and only) way to do it is to spam a lot of businesses in as many towns as you can. And also to try and build only the best production types (velvet). The only patterns i've found have nothing to do with location, i'm afraid. Although it should be noted that you will temporarily lose the profits from a town's business if you are at war with the faction that owns the town.