Composite and Perspective

[screenwriter]

Does anyone know about Compositing images together. I'm not talking about creating layers. James Cameron was talking about how he uses compositing shots to fooling the audience. I was thinking the only way I'd pull off creating an image in photoshop is if I know about compositing... I was hoping someone would know what I'm talking about. I'm new to the idea of compositing. I think that only seasoned professionals know what I'm talking about... how to execute the proceedure in Adobe Photoshop, atleast. John Knoll co-creator of Adobe Photoshop is also works at ILM and it was Photoshop that was first used on the film Abyss.
:confused:
Anyone that knows about compositing has to know about perspective, aerial perspective, this, that, and the other.

I'm still a beginner at Photoshop. Real nervous about using it, since there aren't really any good tutorials.

Thanks for the help!!!