I’ve been wondering about horses too; they may be a long term strategy when the fuel runs out and the machines stop working.
One of the benefits of horses is that they can make more horses, which is a trick the tractors never learned. They are also self-refueling, if they have the raw ingredients. The downside is they are living creatures with their own temperaments and need of special care to keep them happy and prospering. Machines were always more appealing because you could just turn them on and they would work (usually). There’s a saying where I am: Poverty is owning a horse. That has always suggested to me that owning a horse is not an easy deal.
Perhaps a useful skill set would be the knowledge of how to construct buggies, carriages, etc, of which there are few to be found these days.
Bugs Bunny: "I speak softly, but I carry a big stick."
Yosemite Sam: "Oh yeah? Well I speak LOUD! and I carry a BIGGER stick! and I use it, too!" BAM!