I'm a GIS professional. One of my clients (an ArcMap user) has asked our firm to teach some of his staff about ArcGIS online. In so doing, we are to provide an overview of GIS-- how to think spatially, how to visualize data, etc.
My first instinct when teaching "GIS 101" is joining data. You (the client/user) has a dataset (i.e. median income by zipcode), and you want to make a map. Is this possible using only ArcGIS Online?
I think this is one of the most exciting aspects of learning GIS, and I can think of a million ways to achieve this using ArcMap, python, geojson, etc., but I can't seem to figure out an easy to do this using ArcGIS Online. What are my options?