The National Federation of State High School Associations offers online coaching courses for a variety of sports and related issues. They offer both paid and free courses. Find relevant topics here: NFHSLearn.com
USA Football, the National Football League, and the Centers for Disease Control and Prevention are working to make this your best season. Coach members get the tools, resources, and certified education to help make football better and safer. Learn more here: usafootball.com/coach
Coach Youth Tennis program will help anyone working with kids ensure that they have a great time and want to keep playing. They have six FREE courses approved by USTA. Find them here: coachyouthtennis.com
The National Center for Safe Routes to School assists states and communities in enabling and encouraging children to walk and bicycle to school, promoting a healthy and active lifestyle at a young age. They have a database of resources here: saferoutesinfo.org/program-tools/search-resources