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
What can i say is bitcoin is not difficult to understand because if you are interested to one thing even not only in bitcoin if you want that thing you will make a move like research to learn and adopt knowledge about it. I do not believe that bitcoin will hard to learn. Maybe it takes time to learn but if you are willing to learn you will learn.