Trading done through Exchange where buyers and sellers meet and trade for the price they want. SEBI who are responsible for preventing any risk from counter party. Trader can quote any amount of shares and lot in according to current market share price whether buying or selling which he prefers. If market is down he can short sell or up he can do long position. A trade plan is necessary to trade successfully, and to find out stop loss and to find the right entry point. Through technical analysis we can achieve by knowing the strong buyers and sellers side moments. The stock price does not affect the monetary aspects of the company. Because it is only the buyers and sellers who fix the stock price and not the company.