Get into outsourcing
Outsourcing, a relatively new method that has gained popularity due to the growing presence of online business, is one of the best and easiest ways to start earning passive income. You can make money by getting work/order/ from a client/customer and hand it over to people related that particular field.
For instance, you may be good at marketing and you have a big circle of friends due to your outstanding social skills, you can get in touch with people of different expertise and offer them to get them clients and customers.
In order to get customers, you can run a marketing campaign. You can create a blog or website and offer different services on behalf of experts/companies/individuals having technical know-how—and then you can market that website to attract customers. The money you will earn will be in the form of commission from the real service provider, with whom you have already signed an outsourcing agreement.
Rental income is another good source of passive income. If you have a property and is sitting vacant, you can rent it out and start earning money on a regular basis (monthly or yearly).
Rental income has been one of the oldest methods of passive income and people usually invest in real estate to purchase property with the intention of renting it out later.
Stock/bonds and other securities
If you have enough money, but you are afraid of investing in a business and facing an intense competition in the market, you can use it to buy stocks and earn dividends. You can get in touch with a company that invests in mutual funds and bonds. All you have to do is open and account and give these companies cash, they can carry out investment on behalf of you and give you income on a regular basis.