The basic concept of diffusion is to soften the light used on the subject. Using something to diffuse the light increases the relative area of the light. One example of diffusing light is putting some diffusion gel onto the barn doors on the light you're using to soften the light. Another example of diffusing light is using a diffusion box on the light to prevent spill light from coming out. The basic concept of bouncing light is using the thing that your bouncing light off of as your diffusion and you shine a light onto the thing that bounces the light and that thing shines a softened light onto you. The thing that bounces the should be larger than the light source so that the softer light is generated. An example of bouncing light is bouncing light from a foam board. Another example of bouncing light is to take a reflector fabric and placing onto a diffusion panel to bounce the light onto the person. Some ways I can diffuse light in my photos is I can get a spare foam board from a past project and use it to bounce some softer light from a lamp onto something that Im taking a picture of like a computer mouse of tv remote. I can also use some diffusion gel and shine a large bright light through it to soften the light to create a nice scene if Im trying to take a portrait of someone. I would also use the 3 point lighting system to help with taking that portrait. Mrs. Laird, I did what you said and just put the 3 point lighting thing on my video production blog since they are pretty much the same.