Take a look at the caged guitar method:

http://www.premierguitar.com/articles/19390-7-the-guitarists-guide-to-the-caged-system

http://guitaristsource.com/lessons/CAGED.shtml

There are a lot more info, just google/bing caged guitar method.

Since you are learning the notes on the guitar neck using this method should help you with those triads. Although it is shapes it will be beneficial as guitar is an instrument of shapes. I think what your teacher was referring too was don't just learn guitar fingerings, learn the notes under those fingers.


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