You should always feel free to grow a garden, but you shouldn’t necessarily expect it to be cheaper than buying food. Especially the first year, if you don’t live in a place where you can just dig up some dirt and chunk seeds in it. Even if you do you should make sure the soil isn’t literally toxic first, especially since it’s common to have a buildup of things like lead or arsenic from now-outlawed fertilizers that can be absorbed by plants.

My grandparents planted maybe half an acre? Of crops for 10 people, and it was supplemental, not a complete replacement. It also takes a lot of work and can go to shit if the weather is bad. You can account for some of this by planting a variety of crops, trying to head off drainage and shade issues before they start, and with supplemental watering. But don’t expect everything to be super productive every year, especially in the age of climate change. My sister had some plants not put out at all last year (peppers).