Andreas Antonopoulos supposedly has some very educative YouTube videos and books. I personally never read or watched any of his material, but he's fairly well respected within the community.

However your highest priority in the beginning should be learning how to secure your coins using cold storage, paper wallets or a hardware wallet -- alongside with why it is important to have access to your private keys and to securely store them.

I'd also recommend trying to understand Bitcoin first before looking into alts, otherwise you might miss some of the context on what challenges those alts try to solve that Bitcoin is facing as well. Also try to understand the tradeoffs of each respective approach.