There are lots of short length videos on youtube to understand Bitcoin in very easy ways. People should use google a little. Also, sites like this one provides very informative how-to and guides https://www.bitcoinmarketinsider.com/what-is-bitcoin/
Well its not actually difficult to understand , if youre really determined to learn bitcoin you will add an effort to understand it yourself. You can search for some information in google, watch some videos in youtube.