Why are there duplicate links in WordPress?

Question

WordPress

For example
, /kompaniya/kontakty/
/kontakty/
leads to one page, and without any modifications and plugins, this is bad for SEO and for this they make redirects to glue the pages together.
Is it possible to prescribe some kind of hook or somehow disable this business?
In the admin panel it is configured like this "/%category%/%postname%/"

Answer 1

you can do a lot of things, but without understanding and good plugins (and not the left ones), everything ends up equally sad
yoast seo and the like, don’t they remove this?

Answer 2

Install a normal SEO plugin (yoast), then go to an unnecessary page and look at the canonical tag in the source code (the link in it will lead to the desired URL). If there is, then everything is in order - Google-Yandex will ignore this page.