Lets ask some theoretical questions to see if your familiar with Jojo's cultural impact.
Do you like the Persona video game series? Personas have drawn inspiration from Stands which are an in-universe aspect of JJBA.
Do you like the Street Fighter video game series? Several character designs including Guile, and Rose are base visually on certain characters from JJBA.
Do you like/have heard of Fist of the North Star? JJBA creator, Hirohiko Araki, originally based his designs, and inspirations for Jojo off of Fist of the North Star.
Now for some less serious questions
Do you like very creative, and generally nice fan-bases with incredibly funny in-jokes?
Do you like references to Western Rock&Roll bands, and other such musicians of the 60's-00's?
Do you like manly men making incredibly impossible poses?
Do you like serious action scenes followed by incredibly goofy, and, dare i say, bizarre scenes?
Do you like vampires, sociopaths, and other such deranged enemies?
Do you like villains who are some impossibly evil you can't help, but like every bit of their personality?
Do you enjoy learning actually interesting, and relative historical/cultural trivia?
TL;DR There is too much to Jojo to describe every aspect of it as it is an on-going, and continually changing series of more than 30 year. However even if you were to go into JJBA knowing absolutely nothing about it other than the praise and acclaim of what others have to say it is still a very entertaining, and well done anime that's at least worthy of checking out a few episodes of. If you aren't immediately hook, i'd recommend watching to at least episode three as the first story arc really picks up from there.