Some links to self-study courses on emergency communications.
Radio Amateurs Canada has an Emergency Communicator course. The course is free but there is a $5 charge for the exam.
https://www.rac.ca/certified-emergency-coordinator/
FEMA in the USA has many Independent Learning courses that are free to take. The Telecommunicator Emergency Course is a great one to start.
https://training.fema.gov/is/courseoverview.aspx?code=IS-144.a
FEMA IS Community Hurricane Preparedness is also a free course
https://training.fema.gov/is/courseoverview.aspx?code=IS-324.a