Hello Storytellers,
Foreshadowing is hinting toward a future event. There is a proper way to do this and if done poorly when you drop your big reveal your players are completely lost.
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You see if you hint at what you want to reveal your players will start to guess at what is happening. That doesn't mean you make it obvious, but like in GRRM Game of Thrones there are numerous hints about Jon Snow's father isn't who he thinks it is.
Compare that to the deathly hallows in Harry Potter and there was little foreshadowing for most of the elements there. So it felt like it came out of nowhere and was likewise disorientating.