What would be an interesting and impossible way to classify information is being able to track what leads to real world changed behaviours. I would suggest that it isn't the lists of what to do, but the information that one must ponder until a greater and personal truth is met and realised. As you said, two people can read the same piece and have vastly different experiences. One might have mouldy cheese, the other the foundations for penicillin. The difference is the willingness to be curious enough to find out what may be there. There may be nothing, but to a curious mind, even that is something of value.