[BobKat]

A couple of friends have given me their libraries [MOD: of US Public Domain books] they made in calibre.
Not sure how many , if any, duplicates there are. One told me to copy the library to the calibre folder and use the switch library folder to point calibre to that folder.
I aked them the same question and they had no clue. They said they just add books as they go and add their own notes.
So if I have two or more already done libraries, am I better off making seperate folders and seperate libraries? or is is ok to highlight that folder with the add books function from calibre and add one library to the other?

I hope I am making sense. I am still trying to figure out how things are put together here.

If there is a library, I take it there is a data file of some sort that has all the book organization such as author, series, genre, etc... information on it? or does it just read that info from the metadata?
Guess I am trying to figure out if I use someones library and use the add books function, would I lose the info that that person has set up? or would it matter?