Bogdan Fiedur talks about Blockchian, Ethereum, Bitcoin, ICOs: What Do I Sell?

If your blog is about social media, or internet marketing, or affiliate sales, if that is your passion, pick products and services that cater to the kind of people who will read your blog.
If your blog is about horses, look for products and services that those people will be interested in.
This is called targeted marketing. It requires serving your market exactly what they are looking for.