Not enough ammo for stock market being profitable. Yet.
Also too much fees for stock market stuff, specially if you invest abroad. And you are not allowed to buy fractions of a stock.
And right now the fundamentals for the stock markets are not the best, in my opinion
I've been invested in the stock market for 20+ years. When I started, the market was at 6,000. Now the market is at 17,000+, so the stock market has been very good to me. But the most important thing about the stock market is that it is a long term investment. You don't go into the market for months; you go into it for years, and if you do, you will make money.
Fees are pretty low, in my opinion. It is best to get help with your investment--I have Wells Fargo Advisors and it has been excellent.