Are you tired of your day job? Do you own a website and you have no idea how to make it profitable? The answer is simple: you need backlinks. But perhaps we are moving too fast, so let us take things one at a time.
A profitable website is one that lures a lot of visitors and turns them into paying customers. In order to attract visitors, you need a high position in SERPs, because most people use the search engines to find what they need, and, if you are not on the first results pages, no one will ever know that you exist.
Unfortunately, Google and the other search engines only pay attention to the popular websites, with thousands of links from different internet users pointing to them. It is just like when looking for a job. Everywhere you go, they ask for experience, but how are you supposed to gain experience if no one will hire you without it?