There is a skill I have not yet heard taught, but that is invaluable: the ability to remember what it was like before you knew something.
For example, a good story teller needs to be able to put him or herself into the mind of their characters so that the ‘revelations’ are best timed – this requires putting oneself in the position of the character (and by extension the listener/reader) – of not knowing what you know (as the author), and reacting appropriately to each twist and turn of the plot.
Now it occurs to me, that when we remember our own past, we often forget that the person in the memory is not actually us; it was a past version of ourself, that does not know what we know – and should thus be given the same treatment the author gives their character.
Unfortunately, our mind is obsessed with the desire to ensure our memories are consistent with our self image and narrative, and thus when we look back on decisions we made we struggle to identify the true reasoning; we routinely select reasoning consistent with what we know today.
So it turns out, that to truly remember, we actually need to be able to forget!
Postscript: That said, it would be a useful to be able to selectively forget things temporarily; not just to write a good thriller, but to play around and find out which bits of my knowledge are responsible for which bits of my attitude…