If the market is trending down, they would short securities that exhibit weakness when their prices bounce. Most independent day traders have short days, working two to five hours per day. Often they will practice making simulated trades for several months before beginning to make live trades. They track their successes and failures versus the market, aiming to learn by experience.
Liquidity - The liquidity of a market affects the performance of scalping. Each product within the market receives different spread, due to popularity differentials. The more liquid the markets and the products are, the tighter the spreads are. Some scalpers like to trade in a more liquid market since they can move in and out of large positions easily without adverse market impact. Other scalpers like to trade in less liquid markets, which typically have significantly larger bid-ask spreads. Whereas a scalper in a highly liquid market (for example, a market maintaining a one-penny spread) may take 10,000 shares to make a 3 cent gain ($300), a scalper in an illiquid market (for example, a market with a 25 cent spread) may take 500 shares for a 60 cent gain ($300). While there is theoretically more profit potential in a liquid market, it is also a "poker game" with many more professional players which can make it more difficult to anticipate future price action.

Swing traders should select their candidates from the most actively traded stocks and ETFs that show a tendency to swing within broad well-defined channels. Virtually all trading platforms provide a function to enter channel lines on a price chart. The trader should keep a list of stocks and ETFs to monitor on a daily basis and become familiar with the price action of their selected candidates.

Successful traders have to move fast, but they don't have to think fast. Why? Because they've developed a trading strategy in advance, along with the discipline to stick to that strategy. It is important to follow your formula closely rather than try to chase profits. Don't let your emotions get the best of you and abandon your strategy. There's a mantra among day traders: "Plan your trade and trade your plan."

For most students, once his or her accuracy has improved the next step is increasing positions sizes to maximize profits. If you’ve been trading at 65% success with 1:1 or 2:1 profit loss ratios for at least a couple of months you should be starting to feel pretty confident. Now it’s time to increase your position sizes. Since you’ve been working with a $100 max loss, you’ve probably rarely exceeded 2000 shares.
ECNs and exchanges are usually known to traders by a three- or four-letter designators, which identify the ECN or exchange on Level II stock screens. The first of these was Instinet (or "inet"), which was founded in 1969 as a way for major institutions to bypass the increasingly cumbersome and expensive NYSE, and to allow them to trade during hours when the exchanges were closed.[6] Early ECNs such as Instinet were very unfriendly to small investors, because they tended to give large institutions better prices than were available to the public. This resulted in a fragmented and sometimes illiquid market.
Most of our students adopt either my Momentum or Reversal Day Trading Strategies. Once you choose the one that is a good match for your skill level, your risk management tolerance, and the time of day you plan to trade, you are ready to get started. Students in our Day Trading Course can download our written trading plan documents and I’m able to actually oversee them while they are trading.
Scalpers need to be disciplined and need to stick to their trading regimen very closely. Any decision that needs to be made should be done so with certainty. But scalpers should also be very flexible, because market conditions are very fluid and if a trade isn't going as expected, they'll need to fix the situation as quickly as possible without incurring too much of a loss. 
Scalping utilizes larger position sizes for smaller price gains in the smallest period of holding time. It is performed intraday. The main goal is to buy or sell a number of shares at the bid — or ask — price and then quickly sell them a few cents higher or lower for a profit. The holding times can vary from seconds to minutes, and in some cases up to several hours. The position is closed before the end of the total market trading session, which can extend to 8 p.m. EST.

Day trading is the act of buying and selling a financial instrument within the same day or even multiple times over the course of a day. Taking advantage of small price moves can be a lucrative game—if it is played correctly. But it can be a dangerous game for newbies or anyone who doesn't adhere to a well-thought-out strategy. What's more, not all brokers are suited for the high volume of trades made by day traders. Some brokers, however, are designed with the day trader in mind. You can check out our list of the best brokers for day trading to see which brokers best accommodate those who would like to day trade.