How to Add a Custom Skybox
Guide To Beautiful Games In Unity
Objective: All four ways of using custom skybox.
First of all create a new material and name it skybox for easy read.
Now on the Skybox inspector, Select the Procedural Shader inside of skybox to create custom skybox.
Now add images to the six sides to make up the sky to create a 6-sided skybox using 6-sided shader.
Now to create a cube map, you need to first change the image texture shape to cube.
And then finally there is a panoramic shader which can be used using the usual panoramic images to create a skybox.