Using Scenes As Sources
Managing your sources across scenes is cumbersome, especially when you want to swap out something like one person across multiple scenes. Reference scenes are a fantastic workaround.
Setting Up Your Nested Scene
First we'll make a two new scenes. One Labeled "Main" and one labeled "Camera Nested Scene"

Great! Now we'll go over to "Camera Nested Scene" and add our Camera.

Now that we have our Camera, we need to add an Overlay.
If you don't have an overlay, a neat trick I like to use is putting a Color Source behind the Camera, its clean, minimal, and modular to match the color of your whole channel asthetic!

Using Your Nested Scene
Now that we have a Scene to Nest, lets Nest it!
Our Main Scene needs everything that you plan to show for 99% of your broadcast, but for now, we'll just add a Display Capture (a great way to show everything you plan to show/play during your broadcast)

If you'd like to see how to add things like alerts, images, videos, etc. in your scenes, stay tuned for a suplimentary doc to come out for that!
But for now, all we're missing is our Camera, without a nested scene, we would have to add our Camera AND our Overlay everytime we want to use it somewhere, BUT with nested scenes, we can add both at the same time.
Right Click in the Sources Box and look to add "Scene"


And after adding "Camera Nested Scene"(the Scene we just made!) You'll see the Camera and Overlay as we just set it up show in your "Main" Scene. And after some resizing, it should look something like this

And there you have it! a Basic Intro to Nested Scenes!
Down below is an excellent tutorial and overview video by EposVox, if you'd like to see more!