Since you mention permaculture and books, here's one specifically on sustainable biointensive gardening that I've found to be very useful:
How To Grow More Vegetables* by John Jeavons
*than you ever thought possible on less land than you can imagine
https://johnjeavons.org/books-and-videos/ I'm using the 7th edition. I think it's in it's 9th edition by now. Any edition is probably sufficient to start.