If your employer offers a 401(k) plan, it's a good idea to participate, especially if they offer a matching contribution.

Individual Retirement Accounts (IRAs) are also a great way to save for retirement and can provide tax benefits.

Index Funds: Investing in low-cost index funds can be a good option for long-term investors. Index funds track the performance of a specific market index, such as the S&P 500, and provide a diversified portfolio of stocks. 

Real Estate: Investing in real estate can be an excellent way to build wealth over the long term. You can invest in rental properties or Real Estate Investment Trusts (REITs).

Peer-to-peer lending: Peer-to-peer lending platforms allow individuals to lend money to other individuals or businesses. This type of investment can provide higher returns than traditional savings accounts or CDs, but it also comes with risks.

Education: Investing in yourself by furthering your education can lead to better job opportunities and higher earnings in the future.

Remember that any investment carries risk, and it's always important to do your research and consult a financial advisor before making any investment decisions.