I'm going through Chaincode's ₿OSS (Bitcoin Open Source Software) program, it's pretty cool!

I've been learning about Bitcoin core, the foundational technologies like addresses and wallets, the RPC (remote procedure call) to interact with the original implementation, the Bitcoin assembly language, the cryptography underlying the protocol, and so on.

It has been a tough journey so far, and I'm grateful to them. For those interested in something like that you can join their waiting list at https://learning.chaincode.com/#BOSS.