So the idea of having a specific topic for your blog is that doing so lets you reach a specific audience. And that specific audience will be really interested in what you’re blogging about.
It’s about attracting a tribe and sharing with other people who strongly share the same interest. When you attract that audience they’re going to become engaged with your blog.
When your blog is a bunch of random topics then random people might find your blog here and there but they won’t have any reason to engage with your site. They’ll read one post and then leave. It’s like going into a Starbucks looking for a coffee and being offered toys, hamburgers and travel tips instead. Your blog should do one topic and do it well.
Google also likes a targeted blog because in their eyes, when you’re focused on one topic it shows that you have expertise in that topic. And when Google believes you have expertise then they’re more likely to show your site in their search results. It all kind of comes full circle and your blog audience continues to build.
Once you decide on your blog topic, a keyword tool helps you decide what blog posts to write. The keyword tool shows you what people are searching for on Google. When you write a post for a keyword that people are searching for, that post can get those search clicks from Google.