Update 'Guidance.md'

Guidance.md

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 ### FIRST Best Practice Guide Library (BPGL)
 
+- Link: https://www.first.org/resources/guides/
 
+### NSA Cybersecurity Advisories & Guidance 
+
+- Link: https://www.nsa.gov/Press-Room/Cybersecurity-Advisories-Guidance/
+
+### Australian Cyber Security Center Publications
+
+- Link: https://www.cyber.gov.au/acsc/view-all-content/publications
+
+### The Practical Linux Hardening Guide
+
+- Git repo: https://git.csec.ba/CSEC_PUBLIC/the-practical-linux-hardening-guide
+
+### How To Secure A Linux Server
+
+- Git repo: https://git.csec.ba/CSEC_PUBLIC/How-To-Secure-A-Linux-Server
+
+### RHEL Server/Workstation Hardening Guide
+
+- Link: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html-single/security_guide/index
+
+### CentOS 7 Server Hardening Guide
+
+- Link: https://www.lisenet.com/2017/centos-7-server-hardening-guide/
+
+### SUSE Linux Enterprise Server - Best practices
+
+Link: https://documentation.suse.com/sles/12-SP4/#redirectmsg
+
+### Microsoft - Windows security baselines
+
+- Link: https://learn.microsoft.com/en-us/windows/security/threat-protection/windows-security-configuration-framework/windows-security-baselines
+
+### Windows Server Security documentation
+
+Link: https://learn.microsoft.com/en-us/windows-server/security/security-and-assurance
+
+### Hardening Microsoft Windows 10, version 21H1, Workstations
+
+- Link: https://www.cyber.gov.au/acsc/view-all-content/publications/hardening-microsoft-windows-10-version-21h1-workstations
+
+### Awesome Windows Domain Hardening
+
+- Link: https://github.com/PaulSec/awesome-windows-domain-hardening
+
+### Best Practices for Securing Active Directory
+
+- Link: https://learn.microsoft.com/en-us/windows-server/identity/ad-ds/plan/security-best-practices/best-practices-for-securing-active-directory
+
+### NSA - Harden Network Devices
+
+- Link: https://media.defense.gov/2020/Aug/18/2002479461/-1/-1/0/HARDENING_NETWORK_DEVICES.PDF
+
+### NSA - A Guide to Border Gateway Protocol (BGP) Best Practices
+
+- Link: https://www.nsa.gov/portals/75/documents/what-we-do/cybersecurity/professional-resources/ctr-guide-to-border-gateway-protocol-best-practices.pdf?v=1
+
+### Guidelines on Firewalls and Firewall Policy
+
+- Link: https://www.nist.gov/publications/guidelines-firewalls-and-firewall-policy
+
+### Iptables Essentials: Common Firewall Rules and Commands
+
+- Git repo: https://git.csec.ba/CSEC_PUBLIC/iptables-essentials
+
+### SQL Server Hardening Best Practices
+
+- Link: https://www.netwrix.com/sql_server_security_best_practices.html
+
+### Apache HTTP Server documentation - Security Tips
+
+- Git repo: https://git.csec.ba/CSEC_PUBLIC/awesome-security-hardening#user-content-apache-http-server
+
+### Apache Tomcat 9 Security Considerations
+
+- Link: https://tomcat.apache.org/tomcat-9.0-doc/security-howto.html
 
 ## Tools