The Cooperative Extension System is a non-formal educational program implemented in the United States designed to help people use research-based knowledge to improve their lives. The service is provided by the state’s designated land-grant universities. In most states, the educational offerings are in the areas of agriculture and food, home and family, environment, community economic development, and youth and 4-H. (wiki)
They’ll have free soil sample kits, articles and programs/classes for local agriculture, etc etc.
Anything else will be pirated, shitty ad filled ai knockoff apps, or finding a forum of like minded individuals you can ask. There are plenty of resources out there but a “one stop shop” I haven’t found. The problem stems probably from location, information is vast and mostly irrelevant if you’re not in the same growing zones. The local co-ops will have individuals, employees, and articles posted up, they’re really helpful when it comes to reaching out to them in my experience.