2 years I need help with understanding options trading?     

I understand it a decent amount but what I don't understand is selling options.

If I were to buy an 3$(x100), and the stock price jumps from 100-109 dollars, I would be sitting at 900$, so if I sell this option, do I still have a risk of losing everything if it continues to rise?Or can I just exercise the option to lock in the 900$? It's really confusing me with all the terminology.

submitted by /u/lemmedragsack
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