Basic of stock Market-III [Futures & option]

I Learn about cash market/spot market,The Exchange plays a major role in derivative instruments like futures & options.Option contract is only the buyer gets the rights and seller gets premium only for signing the contract.Future contract is both buyer and seller gets the rights at the agreed price.Margin needs to be paid by both buyer and seller.futures/call/put as trading instruments to utilize the price movement in both direction and derive profit from it with little investment.