The ATV Safety Institute offers a wide range of resources and training programs for ATV riders of all skill levels, including online courses, hands-on training, and a wealth of safety tips and guidelines.
https://atvsafety.org/
Arizona State Parks and Trails, the Arizona Game and Fish Department, and the State Land Department have partnered to create a new Arizona Off-Highway Vehicle Guide. This guide highlights places to ride, safety techniques, education programs, OHV laws, and so much more. Check out this great guide to riding in Arizona before you hit the trail!