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?
We have different techniques we can as well follow it's step, as a bitcoin lover you can develop a personal techniques by engaging in trading of bitcoin, and as well adventure into buying and selling of bitcoin or long term holding of cryptocurrency investment, lastly i think another method is to make research of blockchain and also read up of bitcoin for better understanding.
I guess he doesn't necessarily have to create any techniques or any technical skills to hold Bitcoin for long term. Unless he's starting to engage into daily and short trading.
The only hard things to do when you're holding Btc for long term is being patient and know when to sell and when to accumulate more.
And, I agree the OP should have deeper understanding how blockchain works, but I am more concerned about his asset security since he mentioned about investing a large amount of Bitcoin. So, I guess his asset security might be the first thing to learn.