how many different coins i will buy for trading?
is it good to buy and sell 1-6 different coins or just stick to 1 kind of coin?
what coin and what was the best coin that i can be hold for a long time that give me good profit. can i have your suggestion, thanks and gobless !

You have to decide how many coins that are going to buy for trading,but it is better to start with two coins initially,after you become familiar with trading then you can add how many coins you want.
The coin with less price volatility are the best for long term holding so you can find anyone of the crypto currency which has low price volatility based on your capital for investment.