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• https://null-byte.wonderhowto.com/how-to/locking-down-linux-using-ubuntu-as-your-primary-os-part-1-physical-attack-defense-0185565/
• https://null-byte.wonderhowto.com/how-to/locking-down-linux-using-ubuntu-as-your-primary-os-part-2-network-attack-defense-0185709/
• https://null-byte.wonderhowto.com/how-to/locking-down-linux-using-ubuntu-as-your-primary-os-part-3-application-hardening-sandboxing-0185710/
• https://null-byte.wonderhowto.com/how-to/locking-down-linux-using-ubuntu-as-your-primary-os-part-4-auditing-antivirus-monitoring-0185572/

and maybe others?