What you will have is the knowledge to grow food, which you scale up to feed yourself and can others for much longer. That is an extremely valuable skill.
Those four tomatoes will feed you, but only after you have harvested all the seeds, which will grow dozens of plants next season, and feed hundreds of people, and yield thousand sof seeds for an even larger crop next year.
Surviving through the first growing season is the trick.
What you will have is the knowledge to grow food, which you scale up to feed yourself and can others for much longer. That is an extremely valuable skill.
Those four tomatoes will feed you, but only after you have harvested all the seeds, which will grow dozens of plants next season, and feed hundreds of people, and yield thousand sof seeds for an even larger crop next year.
Surviving through the first growing season is the trick.
Only if you grow heirloom tomatoes though. Modern tomatoes are all F1 hybrids so the offspring will be shit probably.
Also print out that wikipedia article about crop rotation. And get a handbook about weeds.