… or updating from versions pre 0.32
With version 0.32 the page bundle feature was added to hugo. This feature makes page exchange/review cycles much more convenient and is a huge step forward. Anyways, this update may put you in a situation you have to update your content structure slightly.
Some useful links:
I struggled a bit and received good help in the forum and if I would have updated hugo for each release effectively reading the release notes this would have been much less weird for me.