Choosing a niche is the most challenging and vital part of starting a blog. A blog's success is determined by its niche/subject. Even if you want to start a hobby blog, you should first brainstorm content ideas to publish on it. When choosing a blog niche, think about what interests and entertains you the most. It can be anything, cooking, knitting, DIY ideas, traveling, technology; the list is infinite. You need to gather ideas about what people are interested in learning more about online by examining what other bloggers have chosen for themselves before you start your own.