Many things about Bitcoin are necessary to know, but which things are necessary to learn at the beginning?
Based on your personal experience, I want to know which things are necessary to know from the beginning.
Before that, I'd like to know your goal in learning about Bitcoin whether it's for investing or something else. If your goal is to invest in Bitcoin, I don't think it's complicated to understand the concept. If your goal is simply to invest in Bitcoin, you just need to prepare some money, create your own non-custodial wallet, and then buy Bitcoin on an exchange and send it to your wallet. It's that simple, and yes, it's not complicated, but you still have to be careful not to mistype your Bitcoin address and also remember to save your wallet phrase. So, if you want to invest in Bitcoin, it's that simple.
But if your goal is to learn about Bitcoin for something else, like becoming a miner, I think that's quite complicated, and I personally wouldn't delve into that stage further. Because I didn't learn much about it either. I'm not interested and prefer investing. So, hopefully, my assumptions can help answer the question you've asked here. And if it hasn't been answered yet, hopefully, you'll find the answer soon.