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. 
Sector leader -- Most of the best starter stocks are either the leader in their respective businesses or very close to it. (You will note this later on in this article when we give some good beginner-friendly stock examples. There's a time and place to invest in up-and-coming companies, but it's smart to save those for after you've learned the ropes.)
This education really ought to include one of the daily papers that covers the movements on the stock exchange (information here) in detail, such as the Financial Times or Wall Street Journal. Remember, the investment bankers that you are competing against have Bloomberg terminals and Reuters subscriptions, while everyone else is watching CNN and MSNBC. Since everyone is reading the same things on the same days, these might not be the best places to pick up your share market tips...
The stock market is made up of exchanges, like the New York Stock Exchange and the Nasdaq. Stocks are listed on a specific exchange, which brings buyers and sellers together and acts as a market for the shares of those stocks. The exchange tracks the supply and demand — and directly related, the price — of each stock. (Need to back up a bit? Read our explainer about stocks.)
Finally, keep in mind that if trading on margin—which means you're borrowing your investment funds from a brokerage firm (and bear in mind that margin requirements for day trading are high)—you're far more vulnerable to sharp price movements. Margin helps to amplify the trading results not just of profits, but of losses as well if a trade goes against you. Therefore, using stop losses is crucial when day trading on margin.
Dollar-cost average: This sounds complicated, but it’s not. Dollar-cost averaging means investing a set amount of money at regular intervals, such as once per week or month. That set amount buys more shares when the stock price goes down and fewer shares when it rises, but overall, it evens out the average price you pay. Some online brokerage firms let investors set up an automated investing schedule.