To make comparisons between companies, sectors and markets a little easier, there are a number of mathematical models used. The most common and often the most helpful is the P/E ratio. The Price to Earnings ratio takes the share price and is divided by the earnings per share. It is possible to calculate this using past earnings, projected future earnings and with all sorts of moving averages ;-) Therefore, this is one number that it is vital for any investor to know and understand.
Should the company management and majority owners choose, they can pay one or more dividends per year to stockholders. The money for these dividends will typically come from profits earned within the business. In most countries, these dividends are subject to income tax payable by the receiver. Often there is a withholding tax taken at source to ensure that non-resident shareholders pay as well. 
Stock mutual funds or exchange-traded funds. These mutual funds let you purchase small pieces of many different stocks in a single transaction. Index funds and ETFs are a kind of mutual fund that track an index; for example, a Standard & Poor’s 500 fund replicates that index by buying the stock of the companies in it. When you invest in a fund, you also own small pieces of each of those companies. You can put several funds together to build a diversified portfolio. Note that stock mutual funds are also sometimes called equity mutual funds.
A share of stock—sometimes called security or equity—is legal ownership in a business. Corporations issue stock to raise money and it comes in two varieties—common or preferred. Common stock entitles the stockholder to a proportionate share of a company's profits or losses. Preferred stock, meanwhile, comes with a predetermined dividend payment. There's more that distinguishes the two types of stock.
Before you raise your hand to complain, yes, we know that a computer can track price changes much better than most humans. We get it. But the aim of the exercise is to get a 'feel' for the movements in price and that is unlikely to happen by using a computer program and pressing a button. We are talking here about stocks for beginners, and beginners need the learning experience, not the quick fix automation. Just trust us...
7. Don’t concentrate on the money – This may sound counterintuitive, but it makes good sense. Having money at the forefront of your mind could make you do reckless things, like taking tiny profits in fear of losing what you’ve already won, or jumping straight in so you don’t miss a move. Instead, focus on sticking to your strategy and let your strategy focus on making you money.

This education really ought to include one of the daily papers that covers the movements on the stock exchange (information here) in detail, such as the Financial Times or Wall Street Journal. Remember, the investment bankers that you are competing against have Bloomberg terminals and Reuters subscriptions, while everyone else is watching CNN and MSNBC. Since everyone is reading the same things on the same days, these might not be the best places to pick up your share market tips...
Finally, keep in mind that if trading on margin—which means you're borrowing your investment funds from a brokerage firm (and bear in mind that margin requirements for day trading are high)—you're far more vulnerable to sharp price movements. Margin helps to amplify the trading results not just of profits, but of losses as well if a trade goes against you. Therefore, using stop losses is crucial when day trading on margin.
Network effects -- In simple terms, a network effect occurs as more people use a service or product, and the product or service itself becomes more valuable and desirable as a result. Think of companies like Facebook (NASDAQ:FB). As more and more people join Facebook, it becomes more difficult for people not to use the platform in their daily lives.

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.
And you can find such stocks in lists like the IBD 50, Sector Leaders, IBD Big Cap 20 and IPO Leaders. For example, fast-growing semiconductor designer and artificial intelligence (AI) stock Nvidia was featured on the IBD 50 before it surged 750%. And Apple has been featured on various IBD lists as it has made big moves in recent years. While, of course, not every stock featured on an IBD list will make the type of moves that Nvidia and Apple have made, it does show why it pays to regularly update your list of stocks to watch using these S&P 500-beating screens.
Assess how much capital you're willing to risk on each trade. Many successful day traders risk less than 1% to 2% of their account per trade. If you have a $40,000 trading account and are willing to risk 0.5% of your capital on each trade, your maximum loss per trade is $200 (0.005 x $40,000). Set aside a surplus amount of funds you can trade with and you're prepared to lose. Remember, it may or may not happen.
Control greed – Greed often influences traders in the following way; you enter a trade at $80 with a target of $95, but then it hits $95 and you think ‘I’ll just hold on a bit longer and increase profits further’. This only ends with you eventually losing big. The solution; stick rigidly to your strategy. Think long term and don’t deviate from your strategy, there’s simply no need to gamble.
Bonus Stock Market Tip: Everything above is related to how best to invest actively - in other words buying and selling into companies that have been selected by you. But what if you don't have the time, money or inclination? What if the paragraphs above put you off? Perhaps you were looking for a simpler guide? The stock market for dummies perhaps?
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.