Skeleton Arguments are documents filed with the Court and exchanged between the parties in advance of a court hearing.
They summarise what you will say to the judge at the hearing.
It’s a broad outline of what you’re going to say to the judge at a hearing.
It’s not meant to contain everything that you might say to the judge. If you make it too long, the judge might not read it at all.
But there’s more to it. Much more.