ArcGIS Living Atlas of the World is the foremost collection of geographic information from around the globe. It includes maps, apps, and data layers to support your work.
John Nelson works in the Content team at Esri, pushing and pulling data in all sorts of absurd ways -and then talking about it. He has far too much fun looking for ways to understand and present data visually, hopefully driving product strategy and engaging users. It's a great website to learn how to create an awesome map within the ArcGIS pro.