Stock trading is a business if one understands the risk vs rewards and able to make decisions rationally. There are multiple options for traders to open a position in the market. They can go for delivery based or intraday trades. For bullish sentiments, one can buy the stock first and sell when the price appreciates. For bearish sentiments, one can sell the stock first when it is higher and close the position with a buy order at a lower price, making profit of the price difference. Short positions of stocks need to be closed within that day.