I cashed out about $450 from a 401(k) when I was 18, and I still regret it.
Most people are financially illiterate. I'm no expert, but just knowing the basics can take you a long way. On average, your money doubles every 7–8 years when invested in the market, and that fact alone motivated me to start investing early and let my money work for me rather than the other way around.
Steps we try to follow:
1. Contribute enough to your 401(k) to get the full company match.
2. Contribute to and max out an IRA.
3. Max out your 401(k).
4. After that, I'm not as knowledgeable, but I put extra money into a brokerage account. Others may choose to invest in individual stocks, buy CDs, or pursue other options.
Many people don't have enough income, but plenty also live paycheck to paycheck while making payments on new trucks, campers, side-by-sides, bigger houses, and other luxuries, yet have no plan for retirement or even a period of unemployment.
Be smart.