mutillidae VS metasploitable3

There's also a bunch of intentionally vulnerable Webapps and VMs aimed at demonstrating potential footholds and common exploits leading to owning of the host including but not limited to: bWAPP, Damn Vulnerable Web App, WebGoat, Metasploitable 3, Mutillidae, Juice Shop

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.

We use OWASPs Mutillidae.

The WAHH contains a pretty solid baseline for understanding web vulnerabilities, but the latest version is from 2011 so it's missing a decade of new techniques. It's not a terrible place to start since a lot of the fundamentals haven't changed in a while, but you'll definitely want to look into things like (as mentioned in another comment) the Web Security Academy as a next step. Other fun options are the OWASP Juice Shop and Mutillidae applications.

There's also a bunch of intentionally vulnerable Webapps and VMs aimed at demonstrating potential footholds and common exploits leading to owning of the host including but not limited to: bWAPP, Damn Vulnerable Web App, WebGoat, Metasploitable 3, Mutillidae, Juice Shop

Note: to practice, you don;t have to attack real targets which are very hard for a beginner anyways.Use a vulnerable on purpose vm to train specific skills.

Set this up, have fun: Metasploitable 3

Op, this is good. But if you want to make your existing DC vulnerable, you can just make download the software rapid7 did to make this box https://github.com/rapid7/metasploitable3/wiki/Vulnerabilities

Metasploitable is a virtual machine image that includes lots of vulnerabilities (on purpose) and that can be used to learn how to hack into a machine.

If you want to do offensive security like penetration testing, learn some tools like Burp Suite and Metasploit and point them at a vulnerable Linux distro. While you're doing that, find some local security user groups and start attending so you can find out about openings right away. The job is to run automated and manual tests against specific hosts and write reports about what you find. A technical writing course is a big benefit here.

you know what i mean

Metasploitable https://github.com/rapid7/metasploitable3 and as someone else also mentioned OWASP's vulnerable/broken apps