Low-cost index funds have been a popular investment method for 30 years, tracking the market to lower risk. However, with so many ETFs available, it can be challenging to choose the best one. Fidelity advises to compare funds tracking the same index, as their performance should be similar before fees. Small differences in fees can compound over time, impacting your returns. Transaction costs are another factor to consider when investing in ETFs, especially if you trade frequently. Understanding tracking difference and error can help you assess how well an ETF is following its underlying index. Taxes are also a crucial consideration, especially in taxable accounts. If investing in a 401(k) or IRA, focus on fees and liquidity, while in a taxable account, consider managing taxes as a cost. Choose ETFs with low turnover rates for core holdings to minimize tax implications.

Read more at Yahoo Finance: 5 Things To Consider Before Buying This Popular Investment, According to Fidelity