How does photoshop cs4 alpha channels work?

Question by Jake: How does photoshop cs4 alpha channels work?
Hi, I would say I am decent with Photoshop but there are still many things that I am unfamiliar with. How do the channels work, I vaguely grasp the concept of masks and vector masks, and please I think the best thing to do to help me is to give me links to video tutorials and maybe a tutorial for what each and every tool does. Thank you all so much!

Answer:

Answer by P&G
As requested, here’s a video tut:
http://revision3.com/pixelperfect/layermasks

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