Bitcoin is the first digital cryptocurrency I know about. I discover it from PTC ads way back 2013 if I remember it right and that time I got the interest of doing online things to earn btc I see the earning opportunity it offers and how it would be a good investment in long term. Then now that I am more aware of cryptocurrency I am also collecting other altcoins but I still need btc to buy them because it is only BTC that has easy way to buy and sell for fiat monry here in our country,