A few years back I converted the back half of our yard from high-maintenance, underutilised lawn to a small food forest. I broke the area into a number of sections, each centred around a fruit tree. Around each I planted companion edibles and flowers with the aim of creating contained micro ecosystems.
Fast forward to now its been a mixed success. Despite the diversity I have had waves of pests sweep through at various times and devestate the garden. I'm a pretty lazy gardener, so I could definitely do more to manage them!
I do love the variety of crop I'm getting though. They mature nicely throughout the year too, so most months there's something to pick. My favourites include feijoa, Panama Berry, mulberry, Atherton raspberry (a native to Australia), sapote and ginger. I grow the staples like citrus, Asian greens, spinach, Kale, etc too.
It's always a challenge to keep up the nutrient inputs without trucking in external manure or fertiliser. I use the wonderful comfrey chop and drop style, and composted kitchen scraps and waste paper.
One unexpected delight with this approach to gardening has been the return of wildlife to the yard. Prior we'd just have mainly pigeons and noisy minors poking about. Now there's wattle birds, wagtails, lorikeets, parrots, magpies to name a few. Lower down blue tongue lizards have moved in, sunning themselves on rocks, slithering through the ground cover and eating any slugs or snails that have the misfortune of moving in.
On reflection, I think of the conversion less as a venture in productive food production and more as a living experiment in making space for things to live and prosper, with some tasty side benefits for the human overlords!