No the user you've replied to, but it's not "either or" that you (might) imply. I would also like to emphasize, pre-Feudal society was as it was due to pre-Fedual technology. The AR-15 and Glock 19 aren't going to disappear with the COVID-23 epidemic or the nuclear flash.

One can learn basic marksmanship fairly well at a local shooting range, but something like Close-Quarters Battle or other necessary-but-uncommon (to civilians) training will require some amount of professional training. How effectively can you clear a room with a pistol or rifle (solo, partnered)? Are you aware of the effects of glass (home, auto) on a round?

Best not to learn these things the hard way.

Let us not forgot, in the original iteration of the American Republic, we (able-bodied men, at least) were all the militia. Even in this ideal "community sticks together" outcome in a SHTF world, you need to have some competencies in shooting.

To contrast, one can more casually learn primitive cooking or home gardening... at home. I, personally, practice martial arts... that's the gist of my daily fitness training.

Though I very much agree, the medical training is one you're going to want to go to a professional for and should not be forgotten amongst the High-Speed Low-Drag oper9r culture that co-travels in survivalist circles.