This specific naming convention is a "scene" standard used to identify the quality and source of the file: The title and theatrical release year. 1080p: The resolution (High Definition, 1920x1080 pixels).
Use the H key to delay the subtitle or G to speed it up while the movie is playing. subtitle Black.Widow.2021.1080p.BR.x264.AAC.6ch...
A community-driven site where you can search by the exact filename to find matching timings. This specific naming convention is a "scene" standard
Since this is a Blu-ray rip, subtitles for other "BRRip" or "BluRay" releases of Black Widow will generally sync perfectly. You can find the specific .srt or .ass files on these major platforms: subtitle Black.Widow.2021.1080p.BR.x264.AAC.6ch...