There are different ways in which you can set the background in Unity. The simplest way is using the UI Canvas to render an image as the camera background
If you are planning to create a Parallax background, then use this tutorial
https://vionixstudio.com/2022/09/22/u...
You can read this tutorial in article format at
https://vionixstudio.com/2023/06/05/h...
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