Ask a pile of PDFs a question
Pasting a 90-page PDF into a chat box works right up until it doesn't. It forgets the middle, it makes up a page number, and you have no way to check. For a stack of documents you need something that reads the stack and shows you where every answer came from.
The difference that matters
A normal chat answers from everything it has ever read, which is why it sometimes answers confidently about your document with something that is not in your document. A notebook tool only answers from the files you gave it, and every sentence comes with a citation you can click.
That one change is the whole reason to use it. You stop having to trust it, because you can check it in two seconds.
What to put in one
Anything long, boring, and yours. Your insurance policy. A lease. Every manual for the equipment in the shop. A year of your own notes. The whole employee handbook nobody has read since 2019.
Keep one notebook per subject. A notebook with your lease, your truck manual, and your kid's school handbook in it will give you worse answers than three separate ones, because it has to guess which world you are asking about.
Ask it like a person, not like a search bar
The check that keeps it honest
Click one citation. Every time, at least once per session. If the quote is not really there, you have learned something important about that pile of documents before you made a decision on it.
When to still use a normal chat
For anything where you want it to think, argue, or write. A notebook is a reader, not a writer. Read in the notebook, then take what you found to the chat and have it draft the letter.
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