I am from Vermont, we had great soil and only add fresh cow manure from our lovely ladies, tilled it in then planted stuff and had an amazing amount of fresh veggies all summer and canned and frozen veg all winter, then I moved to Phoenix via NYC, where I lived for years, so I did not have a garden for 20 years. We bought a little property in South Carolina out in the country and we put in a garden the first year we were here, it was pretty poor the first year a lot of work and wasted money. LOL I found a lot of sites like:
https://www.almanac.com/companion-planting-guide-vegetables to be really helpful.
Our soil was not the best so we started composting immediately to great effect, and we are getting older, so we built raised beds. We did
"Lasagna gardening" layered cardboard, tree limbs from tree trimming, we made a vent tube with chicken wire so that we could feed additional composting material down to the bottom layer (this is meant to replenish the nutrients in your soil, then added compost, top soil, and good soil. The garden output improved but was still not great. We plant marigolds and other pollinators in and around all the beds.
Last year, we found out about companion planting and started with the 3-sisters (Sweet corn, zucchini and green beans.), this worked great, we actually had enough corn to freeze some. This year, every thing has a companion and our garden has really taken off.