. If you already have some extra cash on hand, you can earn even more by lending it out and charging interest on your loans. There are many companies, the largest of which are Prosper and Lending Club, that match prospective lenders with prospective borrowers. Although the industry has been shifting away from private investors, there are still opportunities to be had. If you wish to become a money lender, be sure to abide by any and all applicable laws in your area. Instead of letting the money you have languish in checking account (or under your mattress), put it into an interest-earning account, like a money-market account, a certificate of deposit (CD) account, or a 401k. These types of accounts pay a higher rate of interest than normal savings accounts. Ask a professional at your local bank for help placing money in these types of accounts. Note that these types of accounts may require a minimum balance to start generating interest. They also may require a long-term investment, during which time you will not be able to access your money without paying a penalty. One way to make money without working is to play the stock market to your advantage. Stock trading is by no means risk-free, but if you're smart, careful, and a little lucky, you can stand to make lots of money on the stock market. Whatever investments you choose to make, never invest any money in the stock market that you can't stand to lose.  Low-cost e-trading platforms are ideal for investors who don't want to pay to have their investments managed for them. There are tons of different investment strategies out there, so do your research and find one that works for you. No matter what your strategy, it's important to keep a diverse portfolio and stay up-to-date with changes that happen in the market. . Investing in a successful business is a surefire way to become wealthy, although finding such a company is more challenging. If you are lucky enough to find a business that you really believe in, make sure to do your research before investing. ...

TL;DR in Vietnamese:
Cho vay. Kiếm lãi suất. Đầu tư vào thị trường chứng khoán. Đầu tư vào doanh nghiệp. Mua bán bất động sản.