If the subtitles are slightly off, you can use the 'H' and 'G' keys in VLC to manually adjust the sync by milliseconds.
If your video is: Prison.Break.S01E03.Cell.Test.720p.BluRay.mkv Rename the subtitle to exactly: Prison.Break.S01E03.Cell.Test.720p.BluRay.srt Keep them in the same folder. If the subtitles are slightly off, you can
: A free Subtitle Downloader APK that sources files from providers like SubDl and OpenSubtitles. Best Practices for High Quality If the subtitles are slightly off