Bericht zur Seitenindexierung https://support.google.com/webmasters/answer/7440203#page_with_redirect
Do 404 errors hurt my site? https://developers.google.com/search/blog/2011/05/do-404s-hurt-my-site
Block Search indexing with noindex https://developers.google.com/search/docs/crawling-indexing/block-indexing?sjid=15450004683708556555-EU&visit_id=638747839262171346-635244115&rd=1