Well it’s hard to explain but the short is countries no longer back there currency’s with gold. See Nixon and what he did with the Federal Note. Right now things are not optimal but if you look into the unbanked and what crypto means to them you will get an idea. This is the most important idea for crypto currencies to me. The trust part come from the Blockchain. The P2P allows o third party and reduces time and fees. There are fees to trade now and quite high but to send to each other not so much considering what is normally charged and the time it takes. Some quick points worth reading up on. Pretty simple really but totally baffling on the surface.