Investing in buy and hold funds aren't ask risky as many will tell you. If you leave your money in cash you are losing money due to inflation.
A collection of stocks / bonds and other assets that are managed and trying to beat the market and that is very important
The market normally means the S&P 500 (or the biggest 500 publicly traded companies in America)
Funds that move from stocks to bonds over time as you get older
Even 1% fees will take a lot of your money over time. Mutual funds and target date funds could have some high fees
Low fees and you can literally invest in a group of funds. You might have heard of these as ETF's as well.
The Russell 1000 and 2000 lets you invest in the top 3000 biggest public companies in America.
You can also invest in the biggest international companies as well if you want more diversification.