I intend to invest for a long term worth $ 500.
What coins should I choose and do I have to use all my money?
Right now the market is not stable and no coin is in the position that can attract the investors.Still as the prices are in dip you can invest in some safe coins like ETH,Ripple.If i had to invest 500$ in one coin,i would have invested it in ETH but still my advice is to split investment in both ETH and Ripple as both are very promising and has lots of potential in terms of both fundamental and technical.And one more think please hold after investing.