While both terms - stock market and stock exchange - are used interchangeably, the latter term is generally a subset of the former. If one says that she trades in the stock market, it means that she buys and sells shares/equities on one (or more) of the stock exchange(s) that are part of the overall stock market. The leading stock exchanges in the U.S. include the New York Stock Exchange (NYSE), Nasdaq, and the Chicago Board Options Exchange (CBOE). These leading national exchanges, along with several other exchanges operating in the country, form the stock market of the U.S.
Below is the list of online brokers doing business in the United States. Their names are ordered alphabetically. The table contains brokerage name, firms' website links, commissions on stock and ETF trades, and minimum amounts required to open a new brokerage account. There you could also find the discount stock trading companies ratings as well as links to detailed account reviews.

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. 
Most Wall Street pundits will tell you it's impossible to time the stock market. While it's unrealistic to think you'll get in at the very bottom and out at the very top of a market cycle, there are ways to spot major changes in market trends as they emerge. And by spotting those changes, you can position yourself to capture solid profits in a new market uptrend and keep the bulk of those gains when the market eventually enters a downturn.
Fair Dealing in Securities Transactions: Depending on the standard rules of demand and supply, the stock exchange needs to ensure that all interested market participants have instant access to data for all buy and sell orders thereby helping in the fair and transparent pricing of securities. Additionally, it should also perform efficient matching of appropriate buy and sell orders.
Buy “the basket”: Can’t decide which of the companies in a particular industry will be the long-term winner? Buy ’em all! Buying a basket of stocks takes the pressure off picking “the one.” Having a stake in all the players that pass muster in your analysis means you won’t miss out if one takes off, and you can use gains from that winner to offset any losses. This strategy will also help you identify which company is “the one” so you can double down on your position if desired.
×