I bought a linked Notebook on Etsy, just to have a basic category system. I think it has 13 categories, and each Category has 20 pages by default, with links to each page. ~250 pages in total. And if you need to go massive, then you can use the sub-categories (single pages) as proper sub-categories, and add more pages after each sub-category, increasing the size indefinitely. Just that there are no links to the manually added pages, but that’s what the categories are for.
And some nice book covers and such, to make the front page look nice.
If I wasn’t using (and preferring) Obsidian as a knowledge-base-app, todo-list-app, and daily-journal-app, I’d probably also buy a calendar template. I’d most likely buy it from WHOLEHEARTED ME on Etsy, just because she also put in the effort to make over a hundred tutorial videos for reMarkable.
As to what other things I like to use the reMarkable for: Have you tried reading an e-book on it? It’s surprisingly good. I’m pretty sure it can’t do EPUB (not tested), but I’d say I prefer it over the iPad, just because it doesn’t have any brightness. It’s effortless on the eyes when reading a book for 3 to 4 hours.
This, 100%.
Moreover, the feeling on the iPad for writing is not good, and it needs a few upgrades (Paperlike screen protector, maybe Paperlike Apple Pencil grip, to make long-time use more comfortable) which is another $60 on top.