jjk

it depends on your preference since if you want the exact details of what happened you should read it.

And if you want to read where the anime left off, u can start from

https://www.mangago.zone/read-manga/jujutsu_kaisen/mrk/mpn_chapter-2020137/pg-1/

u should also read the volume 0 or where the jjk movie will be based from
https://www.mangago.zone/read-manga/tokyo_metropolitan_magic_technical_school/

I mean you should read it from the start if u want to

Do I read the main story before volume 0 or can I just read vol 0 right now?

I think u should read volume 0 first

Ok thanks for the help :)