i think it's important to protect new cryptocurrency fans on some information like dead and inactive coins as every day new coins are pumping into blockchain market.
here this link will help you identify many dean and inactive coins, so you can avoid being losing your funds
https://deadcoins.com and anyone you have more to be added can let us know.
Just look at the coinmarket. If coins dont have a volume, those coins are probably dead or dying. And I found over 1500 cryptocurrency there dead and stopped working forever. A huge number for this market