How can I add more inputs to Post (and CPT) Editing page, Taxonomy Updating page and User Editing page?

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Hello, my previous question was about the WordPress Admin Design System. This one is about how to inject HTML to a certain special pages. I saw ACF & Pods did the job amazingly well. I presume there are some hooks for this problem. But I didn’t see much document about hook for editing page. Moreover, I want HTML elements in Post Editing page have the same behavior like the built-in one, which is able to drag & drop to different location in the page. Is it all about using correct class attr or do I have to register some IDs to Js?

Here are the pages I plan to modify:

1. Dashboard (somewhat I success to modify half of it, can not do the welcome panel)
2. Post (and CPT) Editing
3. Taxonomy Updating
4. User Editing

Hope you guy can gimme a hint or two about this problem. Thanks.

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