How case studies beneficial for Content Marketing?

You could also write a case study about a cause and effect that exists outside your own offerings; these lose the benefit of promoting your services but are also seen as more neutrally informative and trustworthy. Case studies come in a variety of forms, ranging from a single page to several pages, and incorporating both written and visual elements.

Blog posts are the most common, and visual formats like infographics and videos yield a high ROI, but if you want to see the best results, it pays to invest in a more in-depth material.

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source: Forbes