Four Models of Making Money Online
The first model is the affiliate method. You get customers and make money by being a sales agent and referrer for others' products without any capital or any need to launch a website.
The second model is when you are a mediator between customers and suppliers. You are the broker between the wholesaler and the retailer. This is sales without inventory or stock, the drop shipping method, and it can be used to make money online with no or low capital.
The third model is the virtual vendor method, in which you are the retailer. You buy from the wholesaler and sell to the customer.
The fourth model is to use the Internet to introduce and offer your services with no or low budget. The difference between this method and the others lies in the type of products you sell: in this method, you sell services, not goods.
Whatever can be done to make money online is based on these methods. Selecting any of them depends on resources, geographical location and your compatibility with them. For example, if it's not possible for you to have access to and communicate with suppliers, you can't choose the second method. If you don't have any craft or service to offer, you should count the fourth model out. So don't start a business just because others have launched the same business and succeeded at it. Research, evaluate your conditions and resources, and then select your model.