The Google Search Console gives me 404 errors on the tags I deleted

If you have deleted the page, you must expect that they now return the status "404 not found". Google reports 404 errors in case of accidental deletion of pages. When you deliberately delete pages and Google reports "404 Not Found" scan errors, you should not do anything. This is the expected behavior.

It is wrong to say that your Google search console should be error-free. This is simply not the case. Almost all websites reported crawling errors. Exploration errors do not always need to be corrected. When there is nothing wrong, the errors of analysis will not hurt the rest of your site. Check out this message from John Mueller, from Google, who answers the question: HELP! MY SITE HAS 939 CRAWL ERRORS !! 1