There are many top coins to have in ones portfolio. Users can check coinmarketcap to see different kinds of altcoins to buy. Based on my own choice i will love to select the Top 15 in the cryptomarket i mean in coinmarketcap. The likes of BITCOIN, ETHEREUM, XRP, LITECOIN, EOS, BNB, MONER, XLM, and TRON. These sets of altcoins will be very good to have in ones portfolio