I suppose it would be mostly practical skills, cooking, fixing things. Usually had to be done by people themselves.
Maybe also mental things like navigating (with or without paper map) and remembering their daily and weekly agendas.
What other things would be a big difference with the people today?
Road networks in most cities in my country are like someone just dropped a pot of spaghetti. The oldest urban areas here are at most 150 years old too, so it’s not like we can blame the Romans.
What have the Romans ever done for us?
Me living in a city with Roman walls:
Are you saying I can blame the Romans for not knowing an address? Cool.
Actually, it’s a rather small city. It’s hard to get lost when you can easily walk from one end to the other.