Trying to read/watch/etc a little on it to try to establish a vague food swap with friends. Specifically no cash.
Nobody is rich enough to engage in unilateral mutual aid/donations.
David Graeber’s Debt: The First 5,000 Years is an excellent starting point. You don’t have to read the whole thing, even if you read Chapters 2 and 5 (or just chapter 2) you’ll discover a lot!
Radical Reviewer also has a good video on it that summarizes the book pretty well.
Andrewism has a video called How The Barter Myth Harms Us
Look up some examples of Volxkuche. Basically an weekly event of people coming together and for cooking and sharing the meals freely. That’s normally a good starting point for some food bartering on the side with the people that participate.