You could make a human omelet but it would take a long time

Depends a little on how and where you live

• Learning to grow some food (even just herbs on your balcony or windowsill)

You need a large enough container (bucket, bag, pot), with some holes for drainage (plants don't want to sit in water). It needs to be warm enough for the plant you want to grow, and moist enough. Getting the moisture right for seeds and plants can be tricky at first, it will get better with experience. There needs to be sufficient light, some plants need more than others. Research a few easy to grow plants and start with these. If you have little space, grow some kitchen herbs rather than vegetables, they increase the quality of your food by 99% and are expensive to buy, plus they are medicinal as well.

• Joining or creating a local sharing circle

Is there a preferred online portal where a sharing circle in your country might exist already? Facebook? Whatsapp? Telegram? A physical space somewhere? Search there first. If there's nothing, create the space yourself, as an online group, a sharing box in a public space, or an actual group of people you know.

For community sufficiently, groups like Buy Nothing and Everything is Free might be a small piece but they're a great place to start. They've been a wonderful way to shuffle resources to those who need them/can use them, and to build support networks within our community. I've met a bunch of my neighbors, made friends, and leaned on specializations and career experience from people in the group on various projects. I talk about them a lot over on the zerowaste and diy communities.

This isn't really about "You can only be one of the cool kids if you're at least 89.5% self sufficient." It's more on the line of "Hey, try to grow at least one sad plant in the best way you can manage, it's going to make everything a little better." Back when I only had a balcony I had boxes and bags with sad plants, now I have a garden with happier plants. We learn while our plants keep us company, and maybe one day can apply what we've learned in luckier circumstances. No attempt of caring for life is ever really lost.

By the way, if light conditions where you live are really bad you can always grow mushrooms instead of plants, they are not as demanding as plants.

Or hell, here's a dodgy pro-tip if you are a die-hard bacon fan but can't handle the environmental impact: go for a mealworm farm in a drawer. I promise the buggers taste similar to bacon and are the most sustainable animal protein you can imagine. All they need is food scraps and a dark space where they can crawl around. (Don't let them escape into your kitchen)

Of course! Just like our current society, lots of people are needed to make thing run smoothly. Just off the top of my head: clothing repair and upcycling, woodworking, tool librarian, mechanics of all kinds, people to keep everything organized, storytellers, cooks, care for anyone who needs it (children, elderly, disabled) solar techs, plumbers, electricians… I was expecting to run out of ideas but I didn’t and now my thumbs are tired.