Target date funds are designed for people who don’t know how to invest their retirement money. They are well-diversified. They are automatically re-balanced on a regular basis. The asset allocation automatically adjusts as you get closer to retirement. You pick the fund closest to year you turn 65, then just put money in regularly.

If you want to learn more, look into three fund portfolios and index funds. They aren’t necessary if you have a target date fund, but some people like to be a bit more involved with their money.

FYI, I did three fund portfolio until a few years ago, when I switched to target date fund.