When you edit a page in Wordpress, there is a sidebar with "publish", "page attributes", "post thumbnail" and many others on the right ... How to add your functional block to this sidebar? (Or before page content, or after) Need to write a plugin? but with which template editing?

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    This is usually done using the ACF plugin. (www.advancedcustomfields.com) Through it, you can create new fields and indicate where they should be displayed.