In fact, Bitcoin is not difficult to understand. It is a currency, with a linked price. The real difficulty is to understand how bitcoin works and why it is so valuable. You may need some knowledge in economics and IT fields.
You are somewhat right and wrong at the same time, yes bitcoin is easy to understand but that is just scratching the surface but if you delve deeper then that statement gets less true as you go deeper, it is not a bad thing and it is not a requirement to know it all in bitcoin so you don't have to worry about it, the basics are enough.