Sub-niches for Blog

For any topic, you will always have the option of either taking a broad view
of the topic or focusing on specific parts, or sub-niches. Here are some
examples of niches and more focused sub-niches:

Broad Niche                             Focused Sub-niche
Blogging                              Professional Blogging
Investment                          Tech Stocks
Weight Loss                         Low-Carb Dieting

                                    Travel                                  Travel in Asia

It is possible to break topics down further and further. For example,
“Travel in China” would be a sub-niche of “Travel in Asia,” and even more
specifically “Travel in Hong Kong.” Both broad and focused blogs have their
advantages and disadvantages.