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. 
Avoid buying on hope and selling on fear. It's very easy and too tempting to follow the crowd when investing. We often get caught up in what other people are doing and take it for granted that they know what they're talking about. Then we buy stocks just because other people buy them or sell them when other people do. Doing this is easy. Unfortunately, it's a good way to lose money. Invest in companies that you know and believe in — and tune out the hype — and you'll be fine.
Benjamin - The price of the stock does not matter. If you invest $10,000 into a stock trading at $5 or a stock trading at $100, your gain will still be the same. A 10% rise in either stock will give you $1,000 in unrealized gains (profits you have not realized because you have yet to sell the stock). So, find the best stock, regardless of its per share price. - Charles Rotblut

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Warren Buffett is the best example to hit this point home. In 2008, he bet some hedge fund managers $1 million that they wouldn’t be able to make more money in a decade than a cheap, boring index fund. An index fund uses simple investing algorithms to track an index, and doesn’t require active, human management. Conversely, hedge funds stack management fees on top of trading fees to pay for the time and knowledge actual strategists are putting into your investments.

Hold for the long term, five to ten years or preferably longer. Avoid the temptation to sell when the market has a bad day, month or year. The long-range direction of the stock market is always up. On the other hand, avoid the temptation to take profit (sell) even if your stocks have gone up 50 percent or more. As long as the fundamental conditions of the company are still sound, do not sell (unless you desperately need the money. It does make sense to sell, however, if the stock price appreciates well above its value (see Step 3 of this Section), or if the fundamentals have drastically changed since you bought the stock so that the company is unlikely to be profitable anymore.
A stock is intrinsically attached to the financial performance of a company. So if the business is doing well, the value of its shares go up. If it’s trending downward, the shares will lose value. Because of this volatile nature, stocks are some of the riskiest investments you can make. However, along with high risk comes the potential for high returns.
There are many fees an investor will incur when investing in mutual funds. One of the most important fees to focus on is the management expense ratio (MER), which is charged by the management team each year, based on the amount of assets in the fund. The MER ranges from 0.05 percent to 0.7 percent annually and varies depending on the type of fund. But the higher the MER, the worse it is for the fund's investors.
While there is no doubt that the most popular way to buy and sell investments is by opening a brokerage account, many new investors ask how to buy stock without a broker. For those of you who want to go down this path to business ownership, you can do so with varying degrees of success - there is no requirement that you have to work with a broker to invest in stocks or mutual funds, particularly equity funds. Direct investing offers some advantages and disadvantages, which you will need to weigh based on your personal situation, but our goal in describing how it works is to provide you with an overview so you have a better handle on how to invest without a broker by the time you're finished reading. The World's Worst Stock Investment Advice