Options help

#11
anoder newbie how exactly does the sell option work ??? as in if i buy a long call or put option i sell to someone else before the expiry, who in turn can again sell the contract to someone else. a long option can change hands multiple times. what about short options in this context. can the person whom i sold short call or put sell it to someone else before it expires??? what about the margin money??? who pays for if the owner exercises the contract??? :confused::confused::confused:
 

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