Easiest way of earning Altcoins should be joining airdrops and bounty campaigns. There is a big chance of winning a huge amount of Alts from getting this airdrops. There are some online games available too which offers Alts to the players and if you have good blogging skills you can also write for some websites who pay you in cryptocurrencies like BTC, ETH, LTC, AomisGo etc
You have to be careful when joining airdrops. Some of them might breach your privacy; they take your email address and start sending you messages in a bid to trick you to donate some ETH or BTC for more of their tokens. Bounty campaigns here are better; when they turn out to be scam people alert you quickly on their Ann threads.