A Total New Beginner - please help me.
I have over 11,000+ documents in the Calibre, but they are not all books.
Some of the files are from other applications, for example, txt and rtf in the Scrivener application.
How can I delete everything, and then add only the .pdf and .azw?
I even have files dating back 2010 which state:
ERROR: Cannot view: A cold day for murder has no available formats.
I have read the User Guide and watched the Grand Tour Video, as well as some of the other video tutorials.
I am completely lost.
Step 1: Can I "select all" then delete all the files?
Step 2: How do I then add only .pdf and .azw files/books
Thank you advanced for any help you may give me.
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