Learning about the greatest investors of years past will provide perspective, inspiration, and appreciation for the game which is the stock market. Greats include Warren Buffett, Jesse Livermore, George Soros, Benjamin Graham, Peter Lynch, John Templeton and Paul Tudor Jones, among others. One of my favorite book series is the Market Wizards by Jack Schwager.

The solution to both is investing in stock index funds and ETFs. While mutual funds might require a $1,000 minimum or more, index fund minimums tend to be lower (and ETFs are purchased for a share price that could be lower still). Two brokers, Fidelity and Charles Schwab, offer index funds with no minimum at all. Index funds also cure the diversification issue because they hold many different stocks within a single fund.
If you trade stock regularly, you might find yourself accidentally violating the dreaded wash-sale rule. This means you've sold shares of stock and then bought the same or similar shares shortly thereafter. This can cost you huge tax penalties. With a little planning, you can avoid this fate and still enjoy trading stocks aggressively with a little planning. 
Passive investing is what long-term investors do — and the intent behind their actions is very different. Their approach to buying and selling stocks is considered passive in that they tend not to transact often. Instead of relying mostly on technical analysis (as active traders do) and trying to time the market, passive investors use fundamental analysis to carefully examine the strength of the businesses behind the ticker symbols and then buy shares with the hope that they’ll be rewarded over years — decades, even — through share price appreciation and dividends.
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Ignore “hot tips.” WallStreetHotShot4721 on the EZMillion$Trade forum and the folks who pay for sponsored ads touting sure-thing stocks are not your friends, mentors or bona fide Wall Street gurus. In many cases, they are part of a pump-and-dump racket where shady folks purchase buckets of shares in a little-known, thinly traded company (often a penny stock) and hit the internet to hype it up. As unwitting investors load up on shares and drive the price up, the crooks take their profits, dump their shares and send the stock careening back to earth. Don’t help them line their pockets. If you’re looking for a guru, bookmark Warren Buffett’s annual letters to shareholders for commonsense advice and observations on sane, long-term investing.
Different investors are going to prioritize different things. A day trader, for example, requires speed and flexibility. A first-time trader may value educational resources and reliable customer support. But one thing every trader should care about is cost. Not paying attention to investment expenses is like revving your car engine while filling it with gas. That's why we spent a lot of time balancing price with what each site offered.
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How much money should I invest in stocks? If you’re investing through funds — have we mentioned this is our preference? — you can allocate a fairly large portion of your portfolio toward stock funds, especially if you have a long time horizon. A 30-year-old investing for retirement might have 80% of his or her portfolio in stock funds; the rest would be in bond funds. Individual stocks are another story. We’d recommend keeping these to 10% or less of your investment portfolio.