This is the 9736th most frequent Swedish word.
gitarrundervisning
"Guitar instruction."
The word 'gitarrundervisning' is used here as a subject of a book, implying it's about the method or the art of teaching guitar.
Jag har en bok om gitarrundervisning.
I have a book about guitar instruction.
In this case, 'gitarrundervisning' refers to the act of providing guitar instruction or lessons as part of a personal teaching approach.
Hans gitarrundervisning är mycket engagerande.
His guitar lessons are very engaging.
Here, 'gitarrundervisning' is described as a service or expertise being sought for teaching purposes.