There are two primary divisions of professional day traders: those who work alone and/or those who work for a larger institution. Most day traders who trade for a living work for a large institution. These traders have an advantage because they have access to a direct line, a trading desk, large amounts of capital and leverage, expensive analytical software, and much more. These traders are typically looking for easy profits that can be made from arbitrage opportunities and news events, and these resources allow them to capitalize on these less risky day trades before individual traders can react.
Scalping is a trading style that specializes in profiting off small price changes, generally after a trade is executed and becomes profitable. It requires a trader to have a strict exit strategy because one large loss could eliminate the many small gains the trader worked to obtain. Having the right tools such as a live feed, a direct-access broker and the stamina to place many trades is required for this strategy to be successful.
The swing trader, therefore, is best positioned when markets are going nowhere – when indexes rise for a couple of days, then decline for the next few days, only to repeat the same general pattern again and again. A couple of months might pass with major stocks and indexes roughly at the same place as their original levels, but the swing trader has had many opportunities to catch the short-term movements up and down (sometimes within a channel).
You're probably looking for deals and low prices, but stay away from penny stocks. These stocks are often illiquid, and chances of hitting a jackpot are often bleak. Many stocks trading under $5 a share become de-listed from major stock exchanges and are only tradable over-the-counter (OTC). Unless you see a real opportunity and have done your research, stay clear of these.