Below are just an assortment of tools that help with incident response, security awareness, and endpoint protection.
https://k12cybersecure.com/ - K12 Cybersecurity Resource Center
CISA.gov - Cybersecurity and Infrastructure Security Agency
OpSecEdu - https://www.opsecedu.com/
Mitre ATT&CK Framework - attack.mitre.org
Mitre D3FEND Framework - https://d3fend.mitre.org/
Free Mitre ATT&CK Defender Training - https://mitre-engenuity.org/mad/
Center for Internet Security - CIS Controls for System Hardening- https://www.cisecurity.org/controls/
NIST Cybersecurity Framework - https://www.nist.gov/cyberframework
K-12 Ransomware reference material from CISA.gov
Secure Video Conferencing for Schools