The ending of Re:Zero Season 2 in the light novel is tied to a particular plot development and character arcs. You might want to check reliable fan forums or official announcements for the exact details.
It depends on how much of the story you want to explore. You could start from the volume that directly follows the season 2 finale. But if you want a more comprehensive experience, it might be a good idea to start from the beginning of the arc that season 2 left off.
Yes, indeed. The Re:Zero manga exists and presents the story in a graphical format. It might have some differences from the original source, but it still captures the essence and excitement of the series.
The 're zero rem love novel' is significant as it expands on the Re:Zero world. Rem's love in the novel is a key element that drives her actions. It shows how she develops feelings for Subaru, and this relationship is a major part of the overall narrative. The novel can explore her emotions and internal struggles in a more detailed way compared to other mediums.