I am having a hard time selecting more then one object in Edit Mode and can't figure out how to. but I've seen tutorials that are able to. I am using Blender 2.79.
See my answer on this question Can not select faces or edges in 2.8
You can select different objects in the project explorer or go back out to object mode (use the Tab key to switch between the 2 modes).
In edit mode, use the hot keys 1, 2, 3 for vertices, edges, faces respectively.