To help you understand the point of crypto currencies better you need to know why the need for them in the first place.
Back in 2008 the economy sank bad and it was due to the foolishness of the banks. The banks have too much control of the economy. Satoahi made the bitcoin to decentralize the currency system. The banks keep printing and printing money putting us in debt more and more. Crypto currencies was meant to put the economic power in the hands of the people without a central authority to tell us what to do with our money.
Start with the history of the need for crypto up till how it evolved to today. If I explained everything it would take pages and pages to type it all.