Index funds are a type of mutual fund that tracks a specific market index, such as the S&P 500. They are typically much less expensive than actively managed mutual funds, which have higher fees to cover the cost of hiring professional money managers.

2. Use target-date funds.

Target-date funds are a type of mutual fund that is designed to automatically adjust its asset allocation over time as you approach your target retirement date. They are a good option for investors who do not want to have to worry about making their own investment decisions.

3. Use a robo-advisor.

Robo-advisors are online investment platforms that provide automated investment advice and management services. They are typically much less expensive than traditional financial advisors, and they can be a good option for investors who want to save money on investment fees.

4. Consider self-directed investing.

If you are comfortable making your own investment decisions, you can save money by investing directly in stocks, bonds, and other securities. However, it is important to do your research and understand the risks involved before you start self-directed investing.

5. Minimize trading costs.

Every time you trade stocks, you pay a commission. These commissions can add up over time, so it is important to minimize them as much as possible. One way to do this is to use a discount broker, which charges lower commissions than traditional full-service brokers.

6. Be aware of tax implications.

Investment gains are taxed, so it is important to be aware of the tax implications of your investment decisions. One way to minimize your tax liability is to invest in tax-efficient investments, such as municipal bonds and qualified dividend stocks.

7. Don't chase performance.

Past performance is not a guarantee of future results. It is important to remember that even the best-performing investments can lose value in the future. Don't chase performance by investing in hot stocks or funds. Instead, focus on building a diversified portfolio that is appropriate for your risk tolerance and investment goals.

8. Stay invested for the long term.

The stock market is volatile, and there will be times when your investment portfolio loses value. However, it is important to stay invested for the long term. Over time, the stock market has tended to go up, and investors who stay invested have been rewarded for their patience.

By following these tips, you can reduce the cost of modern investment strategies and improve your chances of achieving your financial goals.