It is true that BTC is currently correcting, and this is a really good moment to look at and buy Altcoins, but remember to never buy a bad Altcoin on an exchange, so if you are not good at judging how Altcoins are progressing don't ever buy them, because things like this which is very risky for you in the future. It's better to ask someone around you who is more familiar with the world of Altcoin trading, that way you can find out which Altcoin you should buy there.