You may also notice the part where we have set the hierarchical value to be false. If you would like your custom post type to behave like Pages, then you can set this value to true.

Another thing to be noticed is the repeated usage of twentytwenty string, this is called text-domain. If your theme is translation ready, and you want your custom post types to be translated, then you will need to mention text domain used by your theme.

You can find your theme’s text domain inside style.css file in your theme directory. The text domain will be mentioned in the header of the file.