Below are a list of documents and websites that are worth investigating to improve your referee skills:

National Rules and Regulations
Chapter 2 of the AYSO Reference Book is the National Rules and Regulations which answers many AYSO-specific rules not covered by the IFAB Laws but are important to AYSO 10U games (no drop kicks, build-out line, etc.). You can also find rules related to player equipment (casts/splints, hair beads, etc.). 

The Laws of the Game (LOTG)
2024-25 IFAB Laws of the Game – English
2024-25 IFAB Laws of the Game – Spanish
2024-25 LOTG Changes Summary

The Laws of the Game App
2024-25 IFAB Laws of the Game - Apple
2024-25 IFAB Laws of the Game - Android

The Referee section of FIFA.com
FIFA Refereeing

The Referee section of AYSO
AYSO Refereeing

AYSO Online Referee Training Courses
These are accessed through the AYSO 599 website after you've logged in.  See instructions HERE

The Referee section of USSF
https://www.ussoccer.com/referee-program

Ask The Ref – There is a large forum with user submitted questions that are answered by experienced referees.  Just about any question you can imagine has been asked and replied to already.  This is a great source of information if you have a question regarding a specific in-game scenario. http://www.asktheref.com/

Facebook group providing support and guidance to female AYSO referees
https://www.facebook.com/groups/622428462075997/?ref=share