One minor point of clarification: they talk about the soil profile - in backyard settings this has been removed, and then topsoil has been brought in so you’re left with 4 inches of topsoil over your C horizon. The topsoil you have is not the topsoil that was there.

A great resource is the cannabis cultivation podcast with Tad Hussey of KIS Organics. They cover all things organic, including building up a healthy soil rhizosphere, which is how the whole soil ecosystem breaks down nutrients so they’re plant available.

It’s definitely focused on organic cannabis growing, but it goes heavily into general garden practices both indoor and outdoor.

Syntropic agriculture (agroforestry) practices can help with adding organic matter and keeping the soil covered, even on a backyard scale. Prune trees/bushes/whatever and use that as mulch. In temperate climates, the largest pruning would be in the autumn, after trees have started to go dormant, and this pruned material would provide additional soil cover around the trees over the winter, even helping to protect young trees’ roots from frost damage.