How to implement a standard cubemapped skybox?

Yes, please, Epic, please take the time to make a tutorial video on how to make these SkyBoxes.

As someone who’s only interested in space games, the default skybox is something I totally don’t need at least initially, for my game.

Obviously there are a multiple ways to create theses backgrounds, so it would be nice to have a one-stop-shop explanation on how to create and work with them.

-Will