All coaches must complete concussion training.  A free online course is available from the CDC.
https://www.cdc.gov/headsup/youthsports/coach.html

It is also required coaches complete a basic first aid course.  A free online course is available using the link below.
https://www.firstaidforfree.com/free-online-first-aid-courses/

The Little League website has many short training videos available.  Check some of the videos on the below link.
https://www.littleleague.org/university/coaches/

USA Baseball also offers Virtual Community Clinics.
https://usabdevelops.com/USAB/Certification/Virtual_Clinics/USAB/Certification/Virtual_Community_Clinics.aspx?

Previously held Community Clinics
Virtual Coaches Clinics Resources (usabdevelops.com)

Know What the Umpires Know - many videos are available on how various Little League rules are interpreted
https://www.littleleague.org/university/resources/umpire/

Little League Regular Season Pitch Count Rules
https://www.littleleague.org/playing-rules/pitch-count/

If you know of other sites that you would like shared here, please email [email protected]