Go to my blog to learn Agile from experts. It contains a lot of training videos which you can get from You Tube or other sources. I just collected and put in one post, especially for ones like you right now :-)
Just to make things "simpler" for you (;o]) I would add that Agile is a "philosophy" instead of a methodology. The Agile Manifesto don't tell you how to do things, it just give you guidance to think about problems. Scrum could be considered as a methodology for running projects that is based on agile principles (even if I remember reading on a (PMI) blog that Scrum was not considered as a project management methodology).