Image of what I'm talking about:
I can't figure out how I can make holes in that pages where each ring is attached there in several pages beside it like 15-20. How can I cut holes there?
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Simplest way with quad topology would be to cut holes in Subdivided Plane and add Subdivision Surface modifier.
If you want smaller holes you can select Edge Loop around them in Edge Select mode, switch to Pivot Center > Individual Origins, then Extrude and Scale them down.