In this Video, I addressed System Hardening using the CIS-CAT Lite tool.
CIS Benchmarks: https://www.cisecurity.org/cis-benchmarks-overview
NIST – SP 800-123(General Server Security) and 800-53B(Security and Privacy Control) https://nvlpubs.nist.gov/nistpubs/legacy/sp/nistspecialpublication800-123.pdf & https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-53r5.pdf
European Network and Information Security Agency (ENISA) https://www.enisa.europa.eu
CIS-CAT Lite: https://learn.cisecurity.org/cis-cat-lite