Creating a new blog on Tumblr does a few things. First, it allows you to create a blog that is all about your interests. This can be great for promoting your own work or for sharing information that you think other people would find interesting. Additionally, Tumblr lets you create blogs with custom URLs, so you can easily promote your blog outside of Tumblr.
Finally, Tumblr provides some great tools for building an audience around your blog. For example, you can use tags to help people find your blog when they are looking for information on a specific topic, and you can also use Tumblr’s commenting system to engage with your readers.