@Space:
Jojo is basically a series of story arcs, and each arc is classified under as "Part 1", "Part 2" etc etc.
Part 1-Phantom Blood
Part 2-Battle Tendency (both Part 1 and 2 are combined in the 2012 anime series)
Part 3-Stardust Crusaders (introduction of Stands, also referred to by many as the inspiration behind the ideas of Personas)(2014 anime currently airing)
Part 4-Diamond is Unbreakable
Part 5-Vento Aureo
Part 6-Stone Ocean
Part 7-Steel Ball Run
Part 8-Jojolion
Each of these "Parts" cover a different story and features a different protagonist.
They follow a certain timeline sequence of events panning through the years so yea, it's really recommended to start off with the 2012 anime series as they cover Part 1 and Part 2, which introduce the origin of the story.