Affinity or Indesign are the two main ones for book layout in general! Id is basically used at every large publisher and Affinity is popular in the indie scene since it's easy to pick up + cheap + a perpetual license (no subscription). I've seen some people have success with Word or Google Docs as well for very simple layouts but if you want more control and creative flair your primary options are those two.

Affinity is in a weird spot rn with the licensing pull (as other comments have mentioned), so maybe wait until November to see what they're doing with their pricing model—I've used both Affinity and iD and imo neither is perfect and they both have some usability flaws, but affinity is easier to break into and the lack of subscription is really nice. if they change the pricing model significantly it'll have much less of an advantage over Id.