WordPress Website SEO
Before you do anything go to setting and tab Permalinks. Change this from Default to Post name.
To include the category, you select “Custom Structure” and change the value to /%category%/%postname%/.
If you previously had ?p=<postid> as your permalink WordPress will take care of all the redirects for you. This is also true if you change from /%postname%/ to /%category%/%postname%/.
If you change from any other permalink structure save your changes of else changes won’t be saved.