I have found that Khan Academy contributions often serve as an excellent
jumping off point (the following link being a good case in point)



https://www.bing.com/videos/search?q=kha...

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This video describes an excellent overview of MR physics (about 8 minutes).
Jargon does come at you fairly quickly, but you can pause and/or replay as
you start to explore sub-topics like high/low energy states, precession,
spin lattice relaxation, etc.



There are many other videos on other topics like what a patient can expect,
or even full lectures like the following by a faculty member at WUSTL (see:
https://www.bing.com/videos/search?q=kha...

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)



Hope this helps



-Randy