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mutillidae
OWASP Mutillidae II is a free, open-source, deliberately vulnerable web application providing a target for web-security training. This is an easy-to-use web hacking environment designed for labs, security enthusiasts, classrooms, CTF, and vulnerability assessment tool targets.
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I would recommend getting an Ubuntu server VM and installing Mutillidae (and/or OWASP Juice Shop). First learn how to configure and harden your Ubuntu server. Then add it to an internal network with a few other VMs and examine what happens, how they communicate, etc. Then open up your Kali and have some fun with Mutillidae or Juice Shop.