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Working on the ground requires experience. In addition, there may be bad weather and there will be no harvest. If you spend a lot of money on the purchase of seeds and fertilizers, but do not get a harvest, then in this case you can lose the last money. I think this kind of work requires some experience and if a person has never done this before, it will be better to start with something simple.
Yes those are problems but humans have managed to live like that for millennia. A lot of people in my country still live this way, money-poor but they grow enough veggies to not need to buy them. Ideally for someone moving from the city, they'd have a job that can be done online. They have the benefits of living in the countryside (namely having enough space to grow food) and they'd still have money coming in for buying everything else.