The essential idea is that when you have enough of a surplus of something, you give away what you can to friends and neighbors. With everyone practicing this type of exchange, a web of connection is forged. Everyone “owes” everyone else a favor.
In the end, we practice it everyday, at least with your family, partner and closest friends. You help each other out, do some favours here and there. Make a cake, fix the roof, help out with the translation etc.. Well, you could take it to a next level, starting a gift economy in your community.