Question is: What tools are best to use here to ensure I can sleep safely knowing no viruses, trojans, rootkits and other filth have nestled in my systems?

Also curious what are best, reliable websites to keep up-to-date on security best-practices related to this.

PS. I intend to start my scan with ClamAV, followed by chkrootkit and rkhunter as outlined here [2].

[0] https://youtube.com/watch?v=BGsw_l0tT10

[1] https://www.bleepingcomputer.com/news/security/lazarus-hackers-target-linux-windows-with-new-dacls-malware/

[2] https://www.linux.com/tutorials/security-tools-check-viruses-and-malware-linux/