Redirecting requests to deleted threads

I deleted a bunch of old (and I thought useless) threads. Now my SEO tool shows that a dozen of them are in Google's SERP, they keep getting visitors from Google, but return 404, which is not good and has to be fixed.

So my question: what is the best way to set 301 redirects for 20-30 urls?

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source https://xfworld.net/threads/redirecting-requests-to-deleted-threads.47091/