Is there a good Auth and Auth Providers vanilla Javascript Documentation?

So a few werks ago i implementet Supabase Auth in my project and i had my difficultys understanding it because the official docs just providing like 5 lines of code for registration. I found online an example that helped me understand and build it. Today i want to implement the Google provider and again i did everything that the docs say implementez the 3 lines of google signin code and it works till google sends me back to my application. The User Account is created but nothing else works. Redirect is not redirecting me and after signing up with google i wont get signed in automaticly. So i tried to search for an example on how to do this but there is nothing. So my question is, why are the docs so badly made? There is so much information not in the docs that is needed and how do i fix my auth problem?
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