trying to make a face between the selected circles for a disk shape SHIFT TAB should let me select edges then i should be able to make a face, correct? however, the selection to select vertices, edges isn't showing up and when i hit f, a third larger circle appears? what gives? beginner here
You should first join all the paths /shapes by selecting them
hit spacebar search and search "join"
or press Ctrl + J
Once those are one shape, press Space and type in search "convert to"
Here you can see two options, select Convert to mesh
Once that is converted into mesh, go to Edit Mode, and start Filling paths..
Select two edges in two separate paths and hit F, they will be connected.
Now select one edge and keep pressing F
You are dealing with a curve object. Curve objects are different than mehses. You cannot add faces to curves.
You can convert them to a mesh as stated on the other answser. but you can choose to keep them as curves.
If you need more concentric rings, just duplicate one of the rings and resize.
If you must convert to mesh, then press Alt C in edit Mode, select convert curve to mesh. Enter edit mode, select all vertices and do "bridge edge loops"