LTC is the only legit alternative currency.
All the others are bullshit like clones or anon coins or not a currency at all.
Prime Coin, Grid Coin get a worthy mention though.Now you know 
What's new... It doesn't mean you couldn't have fun trading the other altcoins tho. Trading is a fun endeavor by itself. It's a different, kind of a fun calculated form of gambling that you can't get by betting on sports or playing poker.
If ever something big goes wrong with Bitcoin you know what the safe haven coin is.