The string of text in the file name tells you exactly what kind of media you are dealing with: : Likely refers to the "Movie/Series" name and "Episode 3."
: The name of the website or group that originally uploaded the file. Important Note on Safety and Legality Websites like Vegamovies MS EP3 Dual 720p HEVC - Vegamovies.NL.mkv
: The "release group" or website that uploaded/encoded the file. The string of text in the file name
This is a "site tag" or watermark in the filename, pointing to the original uploader or the website where the file was hosted. MS EP3 Dual 720p HEVC - Vegamovies.NL.mkv