Here's a great article on why you should consider umpiring baseball games.
How to Become a Baseball Umpire
NFHS (National Federation of State High School Associations )
And Speaking for the NFHS, here's a link to their site's explanation of the new
P/DG rule: https://nfhs.org/sports-resource-content/baseball-rules-interpretations-2020/
You may have to log into the NFHS's site to view this.
NASO (The National Association of Sports Officials)
Foul Ball Call Reversed
Inning Ending Tag Play at 3rd Positioning
Great Call at the Plate