Firstly check, if website and your targeted pages Url are indexed and cached in Google. Then have a look of google search console if it is notifying any serious site hea...

The Problem is, that the same site should be available with the prices for 2022 and also for 2023. One time it is called with "Prices 2022" and the other time w...

Yes, it is problematic to SEO in the current scenario. The best way of fixing it is through the developer. Just ask your developer to fetch current year and pass prices a...

link rel="canonical" href="https://www.wipfelglueck.de/Baumhaus.php" /

Well, I think one redirect is fine, while 2+ could be harmful. Anyway, I'd make sure that the new content is not being published on the old style URL, redirect all existi...

I did it with `` But if I have my site checked then it is obviously not so optimal for the search engines. The reason is "Internal Canonical Link". What does th...

Just set the canonical URL to the given URL without parameters. https://www.wipfelglueck.de/Baumhaus.php

Can you show me the problem please?

You should remove the pages from Google's cache using the Search Console.

In the case of described issue it will be good practice to declare canonical tag. Avoid 301 redirect because it may put unnecessary load on the server and reduce speed. T...