Digital marketing: This covers a huge selection of services including advertising, social media, blogging, SEO, content marketing and more. This gives you various options to choose from depending on your skill, experience and even interests. See more details on this article: Freelance Digital Marketing: How to Become a Digital Marketer & Get Clients
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Understand how a niche website works. A niche website focuses on very targeted, specific information. The content must be specific, useful and interesting to your target audience. Successful niche websites get anywhere from 1,000 to 10,000 visitors per month. You build content on a particular keyword, and you make passive income with Google Adsense or through affiliate links.