fariborzasgarpour

In WordPress, when you create a main category and create a category as its child, connect some articles to the child category and then open that category, you will see that article in the list of that category. 
So far no problem and everything is working properly. 
Now, if you add a word in the browser address between the main category and the child category, it will still display the same list if that category does not exist and it should be referred to the 404 page.
example.com/parent_category/child_category/ —> post1 , post2 
example.com/parent_category/random_text/child_category/ —->post1 , post2
after install
example.com/parent_category/child_category/ —> post1 , post2 
example.com/parent_category/random_text/child_category/ —> 404
With this plugin, this problem will be solved and a 404 page will be displayed for addresses that do not exist. 
This problem will be very useful for colleagues who work in the field of SEO.

Taxonomy slug fixer

fix the middle slugs of parent category and child category.

Moove Agency

Use radio buttons or checkboxes for your categories and custom taxonomies with this incredibly powerful, easy-to-use, well supported and 100% free WordPress cookie plugin.
(Please note that the “select all” functionality can work with checkboxes only.)
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Select All Categories and Taxonomies, Change Checkbox to Radio Buttons

Thanks Moove for this handy plugin.  Haven't used it long but it helps with clients who are having trouble with Categories / Custom Taxomies.  This helps with the confusion. If you're a developer, this is a handy little tool to install before handing off a website to a client.

Very helpful. Easy to use.

I used it years ago and it was well done. 

But for now it seems to stoped working with newer wordpress versions (with classic editor plugin):

- Wrong Term in Radio list is selected on Editpage Loading, saves the wrong term on update.
- Button [+ Add Term] adds an uneditable id number

maybe in this area there had been changes to the wordpress API that should be updated here.

Was very good

Use radio buttons or checkboxes for your categories and custom taxonomies with this incredibly powerful and easy-to-use plugin.

Taxonomy slug fixer vs Select All Categories and Taxonomies, Change Checkbox to Radio Buttons