The Redo menu I know about, thanks for the tip of pressing F9 to bring back the menu after it disappears. After watching a few videos, I understand now why some Bones need to have the Deform turned off. Thanks a lot for the help Dwayne, there’s a lot of unpack over the coming days.
I had seen those Bones that help direct the Rig while messing around with imported models a long time ago, and figured out that they controlled the direction of whichever part of the body they were attached to. I however thought that they were part of some paid addon that pros use and not something you could set up within Blender without the correct coded functionally that would allow for someone to make it work.