[Cryptography] Where should I start with cryptography?

[Juan Francisco Verhook Greco]

Hi, my name is Juan. I'm a young boy that is beginning with cryptography. I know python and basic c++, linux enthusiast, still though I just began with cryptography I want one day to build my own cryptographic hash function. Where should I begin? I would appreciate any topics regarding anything.Thanks in advance 		 	   		  
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