How to add a new item to the control panel in the WordPress admin?

Question

WordPress

Good afternoon.
Question. Here is how I can insert additional control points in the admin panel? picture is

example

I don't know much about WP technologies. If there is a good training reading or video, then I will be glad to link.

Answer 1

The problem is not in adding an item, but in what you want to add there (into a tab).
If you just add an item + custom fields via ACF (then just install ACF + ACF Options Page)
https://www.advancedcustomfields.com/add-ons/optio...
If you want to add a new custom post type and display it in the menu, then see
https://wp-kama.ru/function/register_post_type