As with any other style of trading, many different methods of scalping exist. The most well-known scalping technique is using the market's time and sales to determine when and where to make trades. Scalping using the time and sales is sometimes referred to as tape reading because the time and sales used to be displayed on the old-fashioned ticker tape, known as the tape.
Spread trading This high-speed technique tries to profit on temporary changes in sentiment, exploiting the difference in the bid-ask price for a stock, also called a spread. For example, if a buyer’s bid price drops suddenly, the day trader might step in to buy and then try to quickly resell at the stock’s ask price or higher, earning a small “spread” on the transaction.
Your account will be designated as “day trader status” if you have 3 round trip trades (one round trip = an opening and closing transaction), in a rolling 5 business day period. If you have 4 round trip trades in a 5 day period, you will be restricted from day trading for 90 days. Your brokerage firm will probably allow you to buy a stock and hold it overnight before closing the position. If you have a second day trade violation, your account will either be restricted from trading or you can request your account be a non day trader status account and buy and then sell after 3 business days. This depends upon the specific brokerage firms rules for some of these details but they are getting very strict with enforcing these rules.
Retail investors are prone to psychological biases that make day trading difficult. They tend to sell winners too early and hold losers too long, what some call “picking the flowers and watering the weeds.” That’s easy to do when you get a shot of adrenaline for closing out a profitable trade. Investors engage in myopic loss aversion, which renders them too afraid to buy when a stock declines because they fear it might fall further.
Order execution: A novice needs to master the art of efficient order execution. A delayed or bad order can wipe out what little profit was earned and even result in a loss. Since the profit margin per trade is limited, the order execution has to be accurate. As mentioned above, this requires supporting systems such as Direct Access Trading and Level 2 quotations.