Staying with the default tagline “just another blog”
A tagline is a one-line description about what your site is. By default, WordPress adds “Just Another Blog” tagline to every WordPress install. Most of the WordPress newbies forget to remove/change it and get it indexed by Google, which is not a good practice.
Hence, it’s advisable to choose a unique and witty tagline that has some relation with your blog niche or content. You can change the default tagline by going to Settings >> General in your WordPress dashboard. Also, don’t forget to delete the sample page that ships with WordPress install.
Read more at http://www.jeffbullas.com/2014/04/14/the-15-most-common-wordpress-mistakes-to-avoid/#0bwir6fhJUfddPBR.99