Cyber 101
Operating Systems
Networking Fundamentals
4. Immersive Labs

3.5.7 Network Hardening (video + reading)

Ensuring devices are properly secured and hardened is key to successful network security. In addition to the video please consult the guidance from NCSC on Network Security.

Additional Reading

https://www.ncsc.gov.uk/collection/10-steps-to-cyber-security/the-10-steps/network-security