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Let's say our goal is to play a I - IV - V - I progression in A{{flat}} Major. On other instruments, it may be necessary to know what the 4th and 5th of A{{f}} is, and to know what notes compose each of the chords involved. On guitar, we only need to know where to find those root notes on the fretboard and which shapes to play.
E-------------------- B-------------------- G-------------------- D-------------------- A-------4----6------- E--4--------------4-- Ab Db Eb Ab
Here are the root notes. We can figure out where these notes occur quickly: