If you are in security, you could do some assignments (like WiFi hacking or disk forensics) using Kali USB stick installation, rather than VM-based installs, but Fedora Security Labs is likely better for this.
Basics:
https://en.wikipedia.org/wiki/Kali_Linux
https://www.kali.org/
Downloads come in a variety of flavors, including ARM, x86-64,
pre-configured OVAs, container images, cloud images, and regular ISO
installs, etc.
https://www.kali.org/downloads/
Installation:
https://www.kali.org/docs/usb/
https://www.kali.org/docs/base-images/
Documentation:
https://www.kali.org/docs/
https://www.kali.org/docs/introduction/