Help please--foreigner trading US stocks

Have opened a US account with an online brokerage to trade stocks and filled up the W8-Ben form as am a foreigner.

My questions are:
1) Do we need to file any other tax forms on an annual basis and if so what forms.

2) Do we have to resubmit W8-Ben form after a certain number of years and if so how many years.


Appreciate your kind advise as have tried to read up on this but am getting confused. Thank you.
 
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