What are the principal technical skills a bitcoin lover needs to have if I want to buy a large amount of Bitcoin and hold it for long-term purposes?
I think we should learn how to secure your wallet against theft and hack. Since you are holding for a long time, be aware of the types of storage: Cold and Hot, Wallets: custodian and non custodian. Encryption, backup up skills.
Skills of sending and receiving bitcoins.
Knowing when to sell and rebuy, you cannot continue hodling even when it's so dangerous.