Hi, Can you please tell me the which type of altcoins we should buy.  Like:- which has already product established or having a strong development or backed by someone very powerful(big companies) or whose idea is best or any other reason which we should consider while buying the coin?

Simple market corrections are going on. hold your coins. Don't invest for small time.

Its Just a correction and nothing else.They have grown exponentially in these days so some market corrections will always happen