I'm quite new to ArcGIS and ArcMap, and am trying to learn the basics. One thing that has me stumped, however, is making a layer editable so I can create features. I have no problems with the tutorial data, but when I go to do it on my own, I do not know how to make a layer editable. Maybe I'm making the layer wrong? I right click on "Layers" in my Table of Contents, and click on "Create New Group Layer". However, I can't even find the symbology tab for said layer, it's simply not there. Anybody who can point me in the right direction is greatly appreciated.