Stocks can be dealt only is a stock exchange through a broker. It is very important to have a trade plan. It is advisable to trade 1% of once capital per trade and limit it to about 5 trades. We should aim to be in the market always and aim at a success rate of 60%. BSE and NSE are the two exchanges through which we can buy and sell shares through a broker. Trading is done based on demand and supply unlike gambling where everything is the result of chance.