Where each post type is located:
You will see various links to each part of your WordPress installation on the sidebar menu.
There are posts, media, pages, comments, appearance, plugins, users, tools, etc. New items will appear on this panel as you add features to your WordPress website.
These new features can be security add-ons, form creation capabilities, integration with your CRM or email marketing software, custom post types, and whatnot.
That’s why WordPress administration panels tend to look very different from each other because each site contains different functions.
You can see here different WordPress sidebars to compare.
Generally, content or data entry to your website tends to be up on the menu. Personalization options to your website’s appearance tend to be in the middle. Finally, down on the list tend to contain extra functionalities and their settings, such as forms, automation, e-commerce manager, and so on.
Clearly, these things can vary a lot based on the developer’s arrangements and there’s a way to reorder them to your preferences.