@anon: The literature and references you’re looking for are completely dependent on the skill set you have in mind. Most people will have one primary skill set and a secondary skill that acts in a supporting role. Carpentry and Sharpening, Farming and Husbandry, Chemistry and Pottery, etc. For the “dropping down the curve” time period there will be maintenance and repair of various items, including solar systems, and building stuff from salvage, like solar hot water systems.
The literature stack for each is unique, and most folk with specific skills have their own set already, because they spent years (and in some cases, generations) acquiring and refining those skills. Most small towns have libraries which will probably be abandoned since they’re government-based. It would be good to have a household dedicate one of its members to opening and maintaining the library again, and seeking contributions of skill-set literature to store and pass on. Can’t predict where these libraries will be, just as we can’t predict which communities will form and thrive, but we can work out general areas where such support is likely to emerge. But that would be after the community has stabilized after reforming itself from BAU dependency to independent sustainability. Again, no predicting any of that.
So each of us is really responsible for refreshing our skill-set, re-orienting it back to its non-electric origins, acquiring the long-term tools necessary and of course maintaining our individual libraries.
But don’t forget; all of that is worth nothing if you can’t get to the sustainable communities.
Hence Wasteland Survival Skills:
(In no particular order) Cart building. Fire making. Land navigation by compass. Observation and mapping. Caching. Camouflage with native materials. Signalling and encrypted message passing. Trapping and Snaring. Water purification. Radiation detection. Primitive cooking. Primitive camping and structures. Knots and lashings. Sewing, leather-work for shoes and such. First Aid and basic medical under primitive conditions. Sanitation on the trail. Archery. Swordsmanship.
I use YouTube a lot to train my kids, followed immediately by a subject-specific field exercise. Most last half a day or less except the ones that require a lot of walking. Periodically there’s an integrative exercise. A person typically has to practice the skill three or four times before they become competent, and then once a year to refresh the memory lest it be lost to other shiny things in this crazy life we have these days. Stuff that involves muscle memory (generally the martial arts) requires regular practice essentially forever.