To me, songwriters who restrict themselves to what a book or person says about 'how' to write songs, have missed the entire point. And no longer 'know ' songwriting. The only way to really 'know ' something, is to test and work with it. To fail at it, and learn from your mistakes. To be extremely familiar with the 'head-knowledge', but also its application.
Some people use the word, 'wisdom '.
So in our case it would be called 'songwriting wisdom'. But still, no matter how much wisdom someone writes down for someone else, it can't be transmitted perfectly to a reader. Like planting a seed. Both knowledge and wisdom are essential. Some people get tons of wisdom without much knowledge.