I looked at MyAnimeList, there is a classic series, it's Devilman, had an anime adaptation in January 5th, 2018. I am interested to watching this series. Quick search for these series, it has a lot of adaptations since 1970's.
Do I have to watch all of those serieses before started to watch Devilman: Crybaby? Are these series unrelated to the past series?
Note: I have never watched or tried to watch this series, so I have no idea about this franchise.