Can I tell AI to use only one Source?
Yes, and naming the source in your prompt is one of the cheapest quality improvements there is. It narrows where the AI looks, but it does not guarantee the figure is right, so check it yourself. If the source is your own document, do not just name it, attach it.
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Does telling ChatGPT not to hallucinate work?
Partly. It lowers the odds but guarantees nothing, so you still need to check. What the instruction really means is: say you do not know rather than guess, so write exactly that. Ask for proof as well, such as citations or the exact passage each answer came from.
Should I give AI a word limit?
Yes, always say how long you want the answer. Give a number, such as 250 words, 500 words or one page, depending on where the text is going. Length belongs in the expectations part of your prompt, at the end, together with the format and tone you want.
What is a Prompt Library?
A prompt library is any place where you keep your reusable prompts: a Word document, an Excel sheet or a notebook page all work. Save a prompt once it gives you good results, then swap the details the next time you use it. That saves rewriting the same instructions again and again.