It took my quite sometimes too to grasp what "mapping" means. Think of it this way: when we read a map, we can see specific places, buildings, landmarks that are "chosen" to be shown by the mapper, while certain things are left out. A street map would be different from a subway map, because some things matter to car drivers, while other things only matter to subway riders.
If we look at it that way, we can start to perceive how bias a map can be. For example, your map of a city will be different from my map of that same city. Each of us see the world differently through our own eyes and experiences. It is through sharing some of our "versions" of the world that we can begin to understand places around us differently.
This one is a booklet of collections of 10 Maps.
10 different maps mapping different things
I got all three from Amazon.