Doing a personal research is the best way to discover pre stage coins I mean earlier stage of the project where the price is relatively very low and the pre sale price is the best entry price for any potential altcoins, since at that stage you be among the early investors that will get some airdrop if the project goes through a snapshot which gift coin holder free coin based on their holdings during the network snap, and if when the coin gets listed on exchange and the value increase their will gain a lot since pre sale price are relatively low.