One can earn independently earn from digital marketing, by providing services as a freelancer : services related to one's skills, such as website designing, content creation, programming, and a lot more. Another way is through CPA / affiliate marketing, through various channels such as Quora, Reddit, Facebook, blogging, Google Ads and a lot more.
What are your current skills ? If you mention that then perhaps you could get some ideas related to from where you could make a start. You could also have a look at the Making Money section of BHW where there are lots of newbie friendly methods. Wish you all the best for your internet marketing journey.