[DNSB]

I have no virtual libraries and 2 physical libraries (Intake and Main). I'm not big on having a mass of custom columns so try to keep them to a minimum.

Series: either books have a series/series index or they are not in a series. No custom column needed.

ebook vs pbook? There is a column for that though the pbooks list is shrinking as they are replaced with ebooks.

On device? Nope since I have multiple devices. The only one that has all my ebooks is a Clara HD with a 128GB µSD card. Others just go by what shows up when I connect the device to calibre. I have no real interest in knowing which Kobo, Kindle or Tolino ereader I have a book on.

Purchases vs. loans? Purchases have a book file, loans just have the metadata. No custom column needed. A search for empty formats and not pbook works just fine the few times I want to check.

I do have the custom columns populated from my Kobo ereaders for reading percent/finished, Kobo Last read date, etc. Mostly used when I do a factory reset to restore reading status. Ditto for word and page counts.

As for most of the other information some people find important? To me, they are cold pancakes and no honey? Reviews, ratings & other social information that adds nothing to my enjoyment of the book? Author biographies? A hierarchical imprint list? Fugget it.