You should hold it always if you want to earn on it. Holding is one of the reliable way to have an income in the future.
altcoin are the alternative crytocurrencies lunch after the success of bitcoin.Generally they project themselves as better substitutes to bitcoin.The success of bitcoin as the first peer-to-peer digital currency pave the for many to follow. Many altcoins are trying to target any perceive limitations that bitcoin has and come up with newer versions with competitive advantages.