1. Understand index funds: index funds refer to funds whose investment portfolios are similar to indexes (such as Shanghai Stock Exchange Index and Shenzhen Stock Exchange Index). Because of its low cost, low risk and low management fee, it is favored by investors.

2. Choose a suitable index fund: When choosing an index fund, investors should choose a suitable index fund according to their own investment objectives, investment duration, risk tolerance and other factors.

3. Make a fixed investment plan: Investors can make a fixed investment plan according to their investment goals, such as how much to invest each month and how many times to invest.

4. Regular investment: investors can regularly invest in index funds according to the set investment plan to obtain long-term investment income.

5. Adjust the investment portfolio regularly: investors can adjust the investment portfolio regularly according to changes in market conditions to obtain better return on investment.

6. Check the investment income regularly: investors can check the investment income regularly, understand the investment situation and adjust the investment strategy in time.

The above is the whole content of the fixed investment strategy and the best investment steps of index funds. Investors can invest in index funds according to their investment objectives and follow the above steps to obtain long-term investment income.