courses

• https://skillsforall.com/

Learning games

https://xss-game.appspot.com/level1
https://overthewire.org/wargames/
https://microcorruption.com/debugger/Tutorial

• hacknet on steam
• grayhack on steam

hack me boxes

https://github.com/digininja/DVWA
https://ctflearn.com/
http://ctf.komodosec.com/
https://hbh.sh/home
https://ctf.hacker101.com/
https://www.hackthissite.org/
https://www.hackthebox.com/
https://ringzer0ctf.com/
https://w3challs.com/
https://www.vulnhub.com/
http://pwnable.kr/ https://pwnable.tw/