Protect my sytem against attacks

I follow the course cybersecurity volume 1,2 and nmap. I was wondering if there are more free tools I can use for security for my system. Till now I use Disable Wintracking and Sandboxie.

Thanks

You play with;

https://www.pfsense.org/

https://www.snort.org/

https://securityonionsolutions.com/

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