I think that https://hackthebox.eu it's very useful to all those haxor n00bs like me that wants to test their initial abilities. Anyway It's useful for experts too.
#HackTheBox is an online platform allowing you to test your penetration testing skills and exchange ideas and methodologies with other members of similar interests.
HTB Network Lab currently has 92 vulnerable machines that You can hack.
This Mastodon instance is for people interested in technology. Discussions aren't limited to technology, because tech folks shouldn't be limited to technology either!