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.
Many times, neither a bullish nor a bearish trend is present, but the security is moving in a somewhat predictable pattern between parallel resistance and support areas. When the market moves up and then pulls back, the highest point reached before it pulls back is the resistance. As the market continues up again, the lowest point reached before it climbs back is the support. There are swing trading opportunities in this case too, with the trader taking a long position near the support area and taking a short position near the resistance area.

There are a variety of methodologies to capitalize on market swings. Some traders prefer to trade after the market has confirmed a change of direction and trade with the developing momentum. Others may choose to enter the market on the long side after the market has dropped to the lower band of its price channel—in other words, buying short-term weakness and selling short-term strength. Both approaches can be profitable if implemented with skill and discipline over time.
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.
Tactics used to take advantage of the uptrend can also be applied to trade the downtrend. Again, since it’s very difficult to predict exactly how long a bear rally, or “counter trend” may last, you should enter a bearish swing trade only after it seems that the stock has continued downwards. To do this, examine the bear rally very closely. If the stock heads lower than the counter trend’s previous day’s low, the swing trader could enter a bearish position.

It needs sheer dedication, hard work, patience, quick wit and immense knowledge to be successful in intraday trading. Successful intraday trading involves 90% waiting and 10% execution. So, yes, it can make a trader rich in a relatively short period of time if the correct processes are followed, and yes, it is possible to hold on to the profits in the long-term if the correct strategies are followed.
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.
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.
In addition to knowledge of basic trading procedures, day traders need to keep up on the latest stock market news and events that affect stocks—the Fed's interest rate plans, the economic outlook, etc. So do your homework. Make a wish list of stocks you'd like to trade and keep yourself informed about the selected companies and general markets. Scan business news and visit reliable financial websites.