Understand that for both beginning investors and seasoned stock market pros, it's impossible to always buy and sell the best stocks at exactly the right time. But also understand that you don't have to be right every time to make money. You just need to learn some basic rules for how to identify the best stocks to watch, the ideal time to buy them, and when to sell stocks to lock in your profits or quickly cut any losses.

Before deciding where to allocate your investments, it’s critical to think about your long-term and short-term goals. It’s important to know how much risk you are willing to accept. As you approach retirement, fixed-income securities, such as highly-rated bonds and money market accounts, offer a greater level of safety. But a younger investor might want a more high-risk, high-reward strategy for at least part of their investments to maximize returns over a long period of time.
Experienced investors such as Buffett eschew stock diversification in the confidence that they have performed all of the necessary research to identify and quantify their risk. They are also comfortable that they can identify any potential perils that will endanger their position, and will be able to liquidate their investments before taking a catastrophic loss. Andrew Carnegie is reputed to have said, “The safest investment strategy is to put all of your eggs in one basket and watch the basket.” That said, do not make the mistake of thinking you are either Buffett or Carnegie – especially in your first years of investing.
Risk tolerance is also affected by one’s perception of the risk. For example, flying in an airplane or riding in a car would have been perceived as very risky in the early 1900s, but less so today as flight and automobile travel are common occurrences. Conversely, most people today would feel that riding a horse might be dangerous with a good chance of falling or being bucked off because few people are around horses.
When investing in the stock market, you have to think long term and avoid the temptation to check your portfolio several times per day. All this will do is waste your time, stress you out, and increase the odds that you will make a big mistake and sell at the wrong time. Plan to set up automatic contributions to your investment so you can buy more investments no matter where you are.
There are plenty of interesting and simple online tools which can be used to improve your trading results, such as the Relative Strength Index (RSI). This is just one example from among dozens of possible technical analysis (TA) options, and you will need to discover and decide which ones work best for you. You may need to paper trade to figure out the best TA tools for you and your strategy. Besides these sorts of technical analysis indicators, there are a few "tried and true" rules:

It’s best if you can automate your actual stock investments. Robo-advisors can do this for you, or if you must, you can manually buy stocks every time you receive a paycheck and have money in your savings or brokerage account. The important point is that you make regular investments so that you aren’t tempted to time the market. Regularly investing the same amount is a form of dollar cost averaging, and it helps reduce risk in your stock investments.
Whilst some day traders are tuned in every day from 09:30 to 16:30 EST (for the U.S stock market), many trade for just a 2-3 hour window instead. As a beginner especially this will prevent you making careless mistakes as your brain drops down a couple of gears when your concentration wanes. The hours you’ll want to focus your attention on are as follows:
News events and earnings reports can change the perceived value of a company. Because the stock market functions as an auction, prices sometimes need to adapt for a trade to occur. When there are more sellers than buyers, the price will go down. Alternately, a stock that has more who want to buy than sell will experience a price increase. Buyers and sellers can be individuals, corporations, asset management companies, or others. Price fluctuations can be dramatic in just one day.
Should you sell these five stocks, you would once again incur the costs of the trades, which would be another $50. To make the round trip (buying and selling) on these five stocks would cost you $100, or 10% of your initial deposit amount of $1,000. If your investments do not earn enough to cover this, you have lost money by just entering and exiting positions.
Michael R. Lewis is a retired corporate executive and entrepreneur. During his 40+ year career, Lewis created and sold ten different companies ranging from oil exploration to healthcare software. He has also been a Registered Investment Adviser with the SEC, a Principal of one of the larger management consulting firms in the country, and a Senior Vice President of the largest not-for-profit health insurer in the United States. Mike's articles on personal investments, business management, and the economy are available on several online publications. He's a father and grandfather, who also writes non-fiction and biographical pieces about growing up in the plains of West Texas - including The Storm.
In contrast, professional fund managers (information here) do not want tips. They have dozens of good ideas of their own. They won't be sharing those ideas with you and they will not be expecting you to share yours. Instead, they ask about how you allocate money. "Which sectors and markets do you like and why?" The difference between these approaches is like night and day.
Many orders placed by investors and traders begin to execute as soon as the markets open in the morning, which contributes to price volatility. A seasoned player may be able to recognize patterns and pick appropriately to make profits. But for newbies, it may be better just to read the market without making any moves for the first 15 to 20 minutes. The middle hours are usually less volatile, and then movement begins to pick up again toward the closing bell. Though the rush hours offer opportunities, it’s safer for beginners to avoid them at first.
Why I’m buying: Spell out what you find attractive about the company and the opportunity you see for the future. What are your expectations? What metrics matter most and what milestones will you use to judge the company’s progress? Catalog the potential pitfalls and mark which ones would be game-changers and which would be signs of a temporary setback.