The visual appearance of your WordPress blog is controlled by themes. When you first visit your blog, it will look something like this:
This is not very appealing to most people.
Customizing the look and feel of your blog is by far one of the most exciting and rewarding part in the journey of creating your WordPress site.
You can change your theme by going to your WordPress dashboard and clicking on Appearance » Themes.
Activate the Theme that you want. You can also preview the theme before activating it.
Once you have installed your theme, you can customize it by clicking on the Customize link under the Appearance menu.