I've heard that Steel Ball Run can be read as a standalone series? Is this true or do I have to read through the entirety of the other Jojos first?
Kinda, but why would you skip to it when you can read all of the other parts and enjoy SBR even more?
It's basically a reboot of phantom blood w/stands and callbacks.
It's true but you'll enjoy it more if you've read the other parts. I don't see why you wouldn't read the rest any way. JoJo's is good.