VirtualBox: https://www.virtualbox.org/wiki/Downloads
Kali Linux: https://www.kali.org/get-kali/#kali-virtual-machines
Whonix OS: https://www.whonix.org/wiki/Download
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Linux For Hackers: https://www.youtube.com/watch?v=YT_UlLZHe-k
Network Essentials Course: https://www.youtube.com/playlist?list=PLkpG3YKjv6p5XwncCUIlPFSBNnN4mnhGA
Google 