Scalping is a trading strategy geared towards profiting from minor price changes in a stock's price. Traders who implement this strategy place anywhere from 10 to a few hundred trades in a single day with the belief that small moves in stock price are easier to catch than large ones; traders who implement this strategy are known as scalpers. Many small profits can easily compound into large gains, if a strict exit strategy is used to prevent large losses.
There is a commonly quoted statistic that only about 5 percent of day traders succeed. This is a good approximation. Most people who try day trading will not succeed, yet most of them do not practice everyday for six months to a year either. Time investment and quality practice increase a day traders chances of being in the 5 percent that are successful.
The most significant benefit of intraday trading is that positions are not affected by the possibility of negative overnight news that has the potential to impact the price of securities materially. Such news includes vital economic and earnings reports, as well as broker upgrades and downgrades that occur either before the market opens or after the market closes.

Unlike a number of day trading strategies where you can have a win/loss ratio of less than 50% and still make money, scalp traders must have a high win/loss ratio. This is due to the fact that losing and winning trades are generally equal in size. The necessity of being right is the primary factor scalp trading is such a challenging method of making money in the market.
First, find the lowest point of the pullback to determine the “stop out” point. If the stock declines lower than this point, you should exit the trade in order to limit losses. Then find highest point of the recent uptrend. This becomes the profit target. If the stock hits your target price or higher, you should consider exiting at least a portion of your position, to lock in some gains.
Following the 1987 stock market crash, the SEC adopted "Order Handling Rules" which required market makers to publish their best bid and ask on the NASDAQ.[7] Another reform made was the "Small-order execution system", or "SOES", which required market makers to buy or sell, immediately, small orders (up to 1000 shares) at the market maker's listed bid or ask. The design of the system gave rise to arbitrage by a small group of traders known as the "SOES bandits", who made sizable profits buying and selling small orders to market makers by anticipating price moves before they were reflected in the published inside bid/ask prices. The SOES system ultimately led to trading facilitated by software instead of market makers via ECNs.[8]
FX 1-minute scalping is a day trading strategy, as it involves opening a certain position, gaining a few pips, and then closing the position afterward. It is one of the most basic and resourceful trading strategies. The main aspect of Forex scalping is quantity. It is not unusual for traders to place more than 100 trades a day. For this reason, it is important to pick a broker with the smallest spreads, as well as the smallest commissions.
A pure scalper will make a number of trades each day — perhaps in the hundreds. A scalper will mostly utilize one-minute charts since the time frame is small, and he or she needs to see the setups as they shape up in as close to real time as possible. Supporting systems such as Direct Access Trading (DAT) and Level 2 quotations are essential for this type of trading. Automatic instant execution of orders is crucial to a scalper, so a direct-access broker is the preferred weapon of choice.
There is a lot of hype around day trading. Some websites promote it as a way to get rich quick (it isn't), and others say it is impossible (also not true). There are lots of day traders around the world who find success and make a living off the markets, so the truth lies somewhere in between those two extremes. If you've thought about day trading, it's worth your time to read through and understand the concepts discussed below, so you'll be better prepared for what to expect if you decide to proceed.
Software and gimmicky products that promise riches overnight typically have a very short shelf life. They may work for a little while, but ultimately they will fail you unless you know how to make adjustments to the software yourself. Instead of getting suckered into trading product scams you're much better off spending your time and money on your own education.

A trader can measure their performance as a percentage of the trading channel width. The perfect trade would be buying at the bottom channel line and selling at the top channel line, which would be a 100% performance. If a trader captured one-half of the channel, it would be a 50% performance. The goal is to continually increase the performance percentage of the average winning trade.

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. 

Assess how much capital you're willing to risk on each trade. Many successful day traders risk less than 1% to 2% of their account per trade. If you have a $40,000 trading account and are willing to risk 0.5% of your capital on each trade, your maximum loss per trade is $200 (0.005 x $40,000). Set aside a surplus amount of funds you can trade with and you're prepared to lose. Remember, it may or may not happen.