Worth noting: A 401(k) is a type of investment account, and if you’re participating in one, you may already be investing in stocks, likely through mutual funds. However, a 401(k) won’t offer you access to individual stocks, and your choice in mutual funds will likely be quite limited. Employer matching dollars make it worth contributing despite a limited investment selection, but once you’re contributing enough to earn that match, you can consider investing through other accounts.
It's crucial to educate yourself before you wade into any type of investment or investment strategy. This beginner's guide to online stock trading will give you a starting point and walk you through several processes: choosing a discount broker, the 12 types of stock trades you can make, how to select individual stocks, uncovering hidden fees, expenses, and commissions, and much more. 

This section lists the number of stocks that have advanced and declined for the day with the volume of shares traded, as well as the number of new 52-week high and low stocks for each of the exchanges. The numbers include all active stocks for that day. For U.S. Markets, only NYSE and NASDAQ stocks are included, excluding ETF's. NYSE and NASDAQ stocks also exclude unit investment trusts, closed end funds, warrant stocks, preferred securities and any non-SIC classified stock. For Canadian Markets, only TSX and TSX-V stocks are included.