Best site list CTF 

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http://ctf.infosecinstitute.com/

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https://www.hacksplaining.com/ 

http://www.hackthissite.org/ 

https://www.hacking-lab.com 

https://defcon2018.ctfd.io/ 

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https://www.root-me.org/ 

https://www.vulnhub.com/

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https://cryptopals.com/ 

https://tryhackme.com/ 

https://hackthebox.eu 

https://w3challs.com/ 

http://ctflearn.com/

https://365.csaw.io/

http://reversing.kr/

https://picoctf.com/

https://ctf365.com/

http://hax.tor.hu/

http://pwnable.tw/

https://hack.me/

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