Where to begin
"A sustainable system is any system that, in its lifetime, can produce more energy than it takes to establish and maintain it."
If you want to learn more about permaculture the best place to start is with the founder himself, Bill Mollison.
There is a free online resource from Networkearth.org that has Bill’s lectures from 1994 in Texas.
There’s no better place to start learning about permaculture for zero money!