How to serve blogposts taxonomy from root directory instead of /posts

Use markdown when posting here, just like you were writing a post for a Hugo site.

You need to do this, like the examples in the documentation:

[permalinks]
posts = '/:slug/'

No. What I am saying is that it is difficult to answer your question without seeing your site structure, templates, etc.

See https://discourse.gohugo.io/t/requesting-help/9132.

Let us see your code

Include a link to the source code repository of your project, because we really need the context of seeing your templates and partials to be able to help you. It is trivial to do a quick git clone on your repo, then run hugo server in your project, to help you out. On the other hand, recreating your code from screenshots, or sort of guessing at it, is not.

If you can’t share your repository for whatever reason, consider creating a dummy repo that you can share, which reproduces the problem you’re experiencing.