Buy bitcoin, that's the safest and most secured coin you can invest right now. Make it a habit also to read and research about the coins you want to invest in, of course people would want to ask opinion on others but at the end of the day it is still you who decides which coin to invest in, right?
I agreed , if you are looking for the best coin to invest. I will suggest BTC is the right coin for you. It is the most trusted coin so far and you can earn a lot from it. Since the value of it in the market is so high. And in addition to that in BTC you have a lot of feature that you can use.
But if you are looking for an altcoin to invest try the Etherium since it is the second best coin aside from the bitcoin.