First of all, I don't believe that Bitcoin is a complicated technology as far as basic use including security precaution is concerned. We use email facility daily but I am sure that most of us have no idea of how of email actually works in a technical sense behind our mailbox screen. Similarly, Bitcoin and cryptocurrencies have a vast scope if someone wants to learn it in depth but as I said, it is not that much difficult from a user point of view. I have always believed that a practical demonstration of Bitcoin transaction is the best way to learn and explain how Bitcoin and cryptocurrency works.