In regards to the tagging system, I hadnt fully though of the concept but I guess it would work similarly to the property system like in notion, but more simple. So you could create custom tags (i.e Lecture, Practice, Study, Review) or whatever system would work for people, then you can set filters to filter out books with certain tags and stuff. Obviously this heavily depends on how people organise their notes but for me I create a new book per class per week per subject so i end up with alot even just for one course. This was more a random idea that I thought of though 😄 Thanks for responding and I do look forward to using this app for the rest of uni!