Stock Trading is to buy or sell a stock through Online. Investors will create Demat account for online trading through Certified Broker. Intraday trading is to Buy & Sell or Sell & Buy the order within the same day before market closes whereas positional order you can buy and sell the order more than a day. Before Buy or Sell a order, we need to have a plan for the stock entry level, target limit, stop-loss value & Quantity.