I would invest in some cheap coins that will grow in the future! For example: OAx WRC (Workcore) WPR (WePower) and KYC (KYC.legal)

I think it really does not matter if you split between new or old coin for just $50. Fifty dollars is very less amount of money and it wont give you much profit in trading. There is only one possibility that you invest this 50$ in an ICO and if the ICO is genuine and coin is good, you might get 2x to 4x profit but that just depend upon your luck.

For that amount? The fees alone...

For a short period you can buy the appc, he made X3. Maybe it's just the beginning of its upward movement .

If I had 50 dollars maybe I invest in potential coin or invest the new ICO like diwtoken it will increase the price if you invest for long term maybe 1 year hoping will reach the price at $1,000.

This is possible considering some of the new coins have already shoot up multiple times in this 7 days of the new year itself can make things happen for the new ICO coins as well. Since its only 50$ so one can easily take risk and invest on new coins which is very low in price to get the huge returns if its rises in some time.

If I had 50 dollars, I invest in xrp, xlm. Because I think 2018 is the year of xrp, xlm

Select an ICO, and then invest it all. I think experty.io is a good choice.

I think the best crptocurrency to invest was the coin which was private.
DASH is a better choose,because the korea and USA government want collect tax from us.