There are so many references that will help you to understand what bitcoin is, try to find it in google , youtube , blogs, or many other website that explain about bitcoin, the first time i knew about bitcoin, i also got a difficulty to understand, i tried to learn it step by step until now, keep learning buddy
Yes, at first it's so hard to understand but if you are willing to learn and you have dedication you need lot's of study there are so many reference you can use to study about in bitcoin you watch in the you tube channel and other website and also you get some information in the forum, there you can read lot's of articles that can improve your knowledge about the new technology of cryptocurrency.