Don’t worry about keeping up a certain pace! Learn as you have the mental bandwidth to do so and don’t press yourself too hard. It sounds like you are already dealing with a LOT and it’s expected that absorbing knowledge when you are stressed and your body is fighting to be healthy will be more challenging. Someone here will always be ready to help when you have any questions!
The Storm character and rig were developed by the Blender Studio. It uses their CloudRig, a rig generation addon similar to Rigify, but developed in-house specifically for the Blender Studio. The CloudRig addon is available via Edit> Preferences> Extensions if you are curious.