Thank you very much for detailed information. I am in F1 status and i am not sure how long i will stay in USA . Do u think it is still worth to try stocks? For me it may be better to think short term goal rather than to get benefit in long  waiting, right?. I actually have one accout in Fidelity through my university but i totally got confused when i started to read information on the Fidelity website and could not decide what exactly i needed to do to invest on stocks.

At first i am interested to invest few thousands (2-5 thousands) so i can learn ways of trading stocks  and also intend to earn some money if not significant amount.

I appreciate your input.