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1 Fretting corrosion is primarily a surface damage phenomenon occurring as a result of small cyclic movements between two materials caused by cyclic loading. Fretting damage can occur in vacuum, although it then would be better to speak of fretting, rather than fretting corrosion.
In short, fretting is how you put your fingers on the strings to get the guitar to sound right! The first thing to be aware of in regards to fretting is that the best spot on a fret to put your finger is the area of the fret directly behind the fret wire. That area is the sweet spot.