Tutorial

#1
Hi,

1)Can you give me link for good tutorial on futures and options
2) I normally trade only in cash yesterday i bought nifty futures at 2960
today what is it expiry? what should i do
what are my possibilities with this nifty future
How do i roll over

3)In stock option the broker keeps aside span margin how is it calculated
does it vary from broker to broker?
also i noted that number of shares per lot is different for different scripts how is the lot size arrived at

Thanks
 

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