I understand the fundamentals and I mine It myself but there was one problem that my dad pointed out that caught my attention. That is the fact that most (almost all ) current cryptocurrencies don't have a physical item like gold with a high value that is backed by it, currently the only thing that gives a cryptocurrency its value is either supply/demand or the service that the coin provides. This is also one of the reasons that I personally believe is causing another factor of insecurity which leads to these huge Fluctuations in the prices of these coins, i'm not saying that this is a bad thing but I think that future and/or current crypto currencies have to invest in other physical methods to give it a more stable value instead of using ETH (ethereum) to determine the coins value.
(This is just my thoughts on current cryptocurrencies)