resources

General

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https://dreamhack.io/
https://play.picoctf.org

 

Pwn

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https://pwn.college/

https://pwnable.xyz/

https://pwnable.tw/

https://guyinatuxedo.github.io/

 

Reverse Engineering

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https://challenges.re/

http://reversing.kr/

 

Web

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https://portswigger.net/web-security
https://websec.fr
https://los.rubiya.kr/

https://webhacking.kr/

 

Cryptography

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https://cryptohack.org/

 

Blockchain

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https://ethernaut.openzeppelin.com/
https://onlypwner.xyz/