The BSA publishes the Guide to Safe Scouting as a guide for conducting safe, and age-appropriate, scouting activities. This essential resource is your go-to reference for any safety questions. All scouters should be familiar with it's contents.
Find the guide to advancement here: https://www.scouting.org/health-and-safety/safety-moments/gss/
Note: This document is updated periodically (usually quarterly). A downloadable pdf version is also found on that link