Stock market is place where buyer and sellers of the shares got connected through online.Stock price is decided by the buyers and sellers.
Long – First buy the shares ,hold it for a time and selling the shares
short – First sell the shares without having and before the day closes we have to buy the shares.
To trade the shares in secondary market we need trading account.
To hold the shares more than one day we need demand account.
Stock market is controlled by SEBI