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
Actually bitcoin is not difficult to understand. If you will just give your time and effort for this you will not having a hard time to understand this. If you understand this you will bring this into your future and you can easily explain this to other people. There is no difficult things in life unless you work hard for it.