How to identify a good deal even if you do the math correctly?

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I know how to run the numbers, but I feel like I'm not doing it like a pro or I'm lacking of confidence, and I would like to know is there a place or book that teach you how to do it correctly . Suggest me whatever you want, books, audiobooks, webinars, courses, etc...

The reason is because I want to raise capital and I want to feel comfortable and full of confidence, I think I'm doing the identify good but it lacks in something I don't know.

P.S I want to get better at this.