Hi there, probably amongst one of the first things you need to do after you install WordPress is to set up your permalinks.
Permalinks are the permanent URLs to Your individual blog posts, categories, archives and others.
This is default address to blog posts after installing WordPress – http://example.com/?p=123, WordPress calls this “Ugly”
You can change permalink settings in Your admin panel Settings–>Permalinks to make them look pretty 
so that you can have SEO-friendly and descriptive URL’s for your WordPress site or blog.
In your permalinks settings you have several options to choose for your permalink structure. I recommend you check the Custom Structure
Once you’ve checked Custom Structure. Enter this %postname% then save changes. Now you have pretty permalinks.
The video demonstrates how to setup your permalink structure
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