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.me/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.me/read-manga/tokyo_metropolitan_magic_technical_school/
Should I read jjk from the start or is it ok to start where the anime left off? If it’s the second option what chapter is it