These sites host massive collections of user-uploaded .srt files for nearly every major TV series:
To find "tutti i sottotitoli per questa Serie TV" (all subtitles for this TV series), you can use dedicated fansubbing communities and subtitle databases. These platforms are the go-to resources for viewers who want to watch shows in their original language or need specific translations that aren't available on official streaming services. Popular Subtitle Databases Tutti i sottotitoli per questa Serie TV