What's the best way to earn through writing articles?

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I've recently discovered various ways to earn online through writing: 1. Ghostwriting through freelance sites 2. Posting on article directories and being paid for performance or by views 3. Posting on article directories about your affiliate links and products (article affiliate marketing) 4. Pay Per Post, Sponsored Reviews, etc. What do you think is the best way to go about using your writing skills?