Review a product you yourself have used in detail. It may include unboxing, pro's and cons, claims by the company, how it actually performs, price etc. The goal is to give in-depth information that anyone would to know before buying a product.
You can write an article, Thread it or both.
I recommend the InLeo frontend to publish your articles to this community because of their Ad Revenue sharing. This ensures that you continue to earn long-term for your hard work and makes sure your content is easily findable with their superior text search feature.