Buy/Sell Doubt

wow . i think this are the very basic things to know about stock market and nobody knows how this works .wow expert traders can't answer this how can you trade without knowing base facts .

1) so lets assume i buy 100 shares of sbi @ 100 and sbi surges to 110 and i want to close my trade , now will my trade close and credited immediately (like in forex ) or will it wait for buy order to match my trade .if it waits for match the order than what if sbi retracts to 106 ,where will my trade close 110 or 106 ??

2) do online stock brokers like kotak,icic,sbi etc provide leverage ,if they do how much? whats the max leverage provided by which broker?

Hope you understood my questions ,thankyou

WHAT IS SHORT-SELLING?

An investor sells short when he anticipates that the price of a stock may fall from the existing price. So, the investor borrows a share and sells it. Once the share price dips, he will buy the same share at a lower price, and return it back, while pocketing a profit in the bargain. Simply put, you first sell at a high and then buy at a low. Short-selling helps traders profit from declining stock and index prices. Since this is usually conducted in anticipation of a stock movement, short-selling is considered a risky proposition.

Let us take an example. Suppose you expect shares of Infosys to fall tomorrow for whatever reason, you enter an order to sell shares of Infosys at the current market price. Once the share price falls adequately tomorrow, you buy at the lower rate. The difference in the sale and buying prices is your profit. However, if the share prices increase after you sold at a reduced price, then you end up with a loss.

wow . i think this are the very basic things to know about stock market and nobody knows how this works .wow expert traders can't answer this how can you trade without knowing base facts .