Get whole playlist; retry after interruption (archive.txt); limit speed to 400K; specify output filename; create description file for each; specify format of download
youtube-dl –download-archive archive.txt -r 400K -o '%(title)s-%(id)s.%(ext)s' –write-description -f 43 https://www.youtube.com/playlist?list=PL7A4D9C100657150E
Get available formats for a video:
youtube-dl -F https://www.youtube.com/watch?v=sO_bbiC19ag