While you build stuff Anno is more of a ressource management game within a city. You need buildings to produce food and materials which will be used to produce other stuff.
Usually you have islands with specific ressource and your job is to manage trade between them to grow your population and upgrade their houses.
Population have needs that need to be fulfilled ans your city building will have to take that into account.
Apparently they have changed a lot of things in the formula this time (and I'm rather scared to be honest) but in past games it worked like that. Build a city, harvest materials, build ships, trade, grow.