Not sure where this link belongs, but figured because Notenik accommodates formats like CSV well that this would be an alright spot.
The specification of CSV holds in its title: “comma separated values”. Okay, it’s a lie, but still, the specification holds in a tweet and can be explained to anybody in seconds: commas separate values, new lines separate rows. Now quote values containing commas and line breaks, double your quotes, and that’s it.
If I recall, the last time the CSV format came in handy for me was when I wanted to convert my LibraryThing catalog into a Notenik collection. I exported it to CSV, adjusted some fields using awk and imported it into Notenik. A fine experience.