When I upload a book to Calibre there are some fields that I will always fill out before I consider the job done.
From Calibre standard setup: title, author, series and series order (if relevant), tag and description.
I have also added some additional metadata to my Calibre setup that I always fill in: purchase date (month, year), read (yes/no), store (or download source, e.g. Amazon, Kobo). I will also include word count if easily available.
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