Dynta Binder Dividers for 3 Ring Binder, 8.5 X 11 Paper Binder Dividers Blank with 5 Big Tabs for School, Office and Home, 15 Sets, 75 Dividers, Colorful

I used loose leaf binders for notes as a student (back in the dark ages of the late naugthies), and used cardboard dividers to split by topic. Something like this: https://www.amazon.com/dp/B0GTLQTM3G/ref=sspa_dk_hqp_detail_aax_0?sp_csd=d2lkZ2V0TmFtZT1zcF9ocXBfc2hhcmVk&th=1 The colorful ones are the best.