This piece for Malachain collects the advice that holds up in practice.
Bare soil between harvests is vulnerable to wind, heavy rain and the loss of nutrients that wash away before the next crop can use them. Cover crops such as clover, rye, vetch or mustard are planted in that gap to protect the ground. Their roots hold soil in place and feed the organisms that keep it healthy, while their leaves shield the surface.
When the cover crop is cut and left on the field or worked into the soil, it returns organic matter and, in the case of legumes, nitrogen. Choosing the right mix depends on climate, the next main crop and the equipment available. Farmers often start with a trial strip on one field and compare the results with untreated ground before expanding.
The most useful step is usually the first one. Pick a single suggestion, try it for a couple of weeks, and then decide whether it is worth keeping. Small, steady improvements last longer than ambitious plans that are hard to maintain once everyday life gets busy again.
It also helps to talk the subject through with friends or colleagues who have tried something similar. Their experience points out the details that guides leave out: how long things really take, which costs were unexpected, and which shortcuts turned out to be a mistake.
There is more to learn on this subject, and the linked website goes into greater depth. Treat this article as an introduction rather than the final word, and check any important decision against up-to-date, reliable sources before relying on it.