Setting up your editing tools and better presets in window

What is a preset browser? What do you mean by user presets and aliases? How to manage preset in Adobe Premiere CS 6? How to create presets its groups and aliases? How to modify it for uses later? What are the important things that I need to remember in applying presets? What do you mean by EPR files? What is the function of Scale to Fit? What about the Scale to Fill and Fit with black borders? What do you mean by H.264? What is AAC audio?

Thank you!