Investing is one of the best ways to increase your money over the long term and achieve your financial goals, but you shouldn't approach investing with the expectation of getting rich quick. History shows that the most dependable way to create wealth is to take a long-term approach.

The stock market can gain and lose value in unpredictable ways, but the best way to cope with volatility is patience. A patient investing approach prioritizes buying and holding quality companies for the long term. This is how long-term investors accrue significant monetary gains — without spending overwhelming amounts of time sweating over their portfolios.

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Long-term investment strategies

Taking a buy-and-hold approach to investing is both the simplest and most dependable way to achieve substantial portfolio returns. While most investors are best served by buying and holding stocks for the long term, that approach still leaves plenty of flexibility regarding which individual companies and investment themes to prioritize. Here's a breakdown of three core long-term investing strategies you can implement:

1. Growth investing: This approach focuses on companies that are expanding their businesses at fast rates and appear primed to continue generating impressive results. Sometimes growth-oriented companies aren't yet profitable or post small earnings, but the best companies display signs of substantial business momentum and have high potential to increase their sales and earnings over time. Outsized growth can translate into big gains for a company's share price.

2. Value investing: This investing strategy centers on buying the stocks of companies that seem undervalued based on their business fundamentals such as revenue, profit margin, and competitive strength. Value-oriented strategies concentrate on buying stocks priced at low multiples of earnings or sales or those that pay attractive dividends. These tactics can reduce your investment risk while still creating opportunities for impressive portfolio gains.

3. Dividend investing: This investing approach prioritizes owning stocks that return value to shareholders in the form of regular cash dividends. A dividend-oriented strategy is often associated with value investing because it's less common for growth stocks to pay dividends. But as a dividend investor, you can still choose to take a growth-focused approach by investing in companies that seem likely to continue increasing their dividends.

Dividend investing can be strongly oriented toward long-term investing by having all dividend payments you receive automatically reinvested. Most brokerages can automate a dividend reinvestment plan (often abbreviated as DRIP), enabling you to harness the power of compounding. Using dividend payments to purchase more stock creates a virtuous cycle by increasing the number of shares in your portfolio that pay dividends, which, in turn, increases the amount of dividends you receive. Over time, you can purchase increasingly more shares using only dividends.

Many investors opt for a mixed approach to portfolio construction, choosing to add a combination of growth, value, and dividend stocks. Each of these categories has something to offer a balanced portfolio.

Being a Foolish investor

Market values always fluctuate and are essentially impossible to predict with certainty. As such, The Motley Fool's investing philosophy eschews attempting to time the market and instead focuses on finding investments that can stand the test of time. Instead of trying to predict when the next crash or big bullish run is coming, investors are best advised to invest in companies with meaningful competitive advantages, strong management teams, and viable paths to long-term success.

Realistically assessing your risk tolerance is another Foolish component of long-term investing success. Some investment strategies may take longer than expected to generate profits -- and not every stock you buy will be a winner. If you're a younger investor, you might be comfortable investing in many relatively risky growth-oriented stocks. However, if you are in retirement or getting ready to retire, your risk tolerance is likely quite different. If you're depending on your investment portfolio to help support you in your nonworking years, which may have already begun, then any sharp declines in your portfolio's value take on much greater significance. Younger investors are more often growth investors, while older investors are more often value or dividend investors.

Portfolio diversification can be beneficial no matter how much money you're investing, but it becomes increasingly important as you invest larger sums. Putting most or all of your money into a single stock could be catastrophic for your portfolio's value if the stock's price plummets. It could take years to recover the money you lose, or it may never be recovered. Spreading your investment dollars among many different assets in many different industries is key to reducing your investment risk.

Any company in which you invest should have a high-quality business and trade at a valuation that leaves room for long-term growth. If you understand a particular sector well and are knowledgeable about the current developments in the space, then it makes sense to invest more of your money in that sector. Investing in industries that you deeply understand makes you more likely to identify relevant developments ahead of most other investors.

Investment strategies for retirement

A patient, well-informed approach to investing can put you on the path to financial freedom and significantly improve your quality of life in retirement. Specialized retirement accounts are some of the most popular investment funds that can help you to achieve your financial goals.

Money that you contribute to tax-deferred retirement accounts, like most 401(k)s and individual retirement accounts (IRAs), reduces your taxable income for the year, although you must pay taxes on distributions received in retirement. Roth retirement accounts don't confer tax breaks for this year, but instead enable you to receive tax-free distributions in retirement.

Both types of retirement savings accounts have tax advantages. Tax-deferred accounts are best suited for people who expect to be in a lower tax bracket in retirement than they are today, while Roth accounts are preferable if you expect to be in a higher tax bracket when you retire.

Some employers offer contribution matching programs for 401(k)s and other retirement accounts. Taking full advantage of employer matching as early in your career as possible can significantly improve your investing performance over time and put you in a much better financial position in retirement. If you can afford to invest money in order to benefit from your employer's retirement matching program, then your goal should be to maximize the matched contributions -- e.g., the free money received from your employer.

Even if you follow all of the above advice, you always accept risk when you invest money in the stock market. But it's worth it because not doing so actually guarantees that you lose money as inflation erodes the value of your cash. Don't delay -- make today the day you start increasing your wealth and building a path to long-term financial prosperity.