ctf games

overthewire
a good hacking ctf for beginners
hackthebox
site with many ctf challenges to play
wechall
a ctf site that links to many ctf sites
xss-game
a game that focuses on cross-site scripting(xss)
prompt riddle
a site where you solve riddles to get to the next level
cmdchallenge
a challenge site that teaches you the command line

offline games

vulrnhub
a site with a bunch of vms to practice on
metaspoitable
a vm to practice metasploit with
buggy web app
a buggy web app to practice web security
damn vulrnable web app
a web app to practice web security
hackmyvm
a site with many vms to practice on and other stuff

other links

appsec ezine
a github ezine with many cool hacking stuff
hacker how to
good document to get into the hacker mindset
hackaday
website with cool hardware hacking projects
phrack
one of the oldest hacker ezines