The brief history of cryptos
Bitcoin as the widely used crypto was initiated from year 2008. Bitcoins need to be “mined”by following PoW rules. From 2008 to 2013, there are many cryptos copying or modifying the codes from bitcoin, to be called alt-coins.
Since 2014, new platform Ethereum was created to provide crypto issuances services. Many crypto projects are issuing their tokens on this platform (i.e. ERC20 tokens). From 2017 - 2018, there were more than 1,000 projects to be listed in different crypto exchanges.
As summary, the history of cryptos is from bitcoin->altcoin-> ERC 20 tokens.