Interpretation
The title The Book of Good Love is inferred from the text, and who or what Good Love may be is not revealed by the author.
The book of Good Love explains how men must be careful about Love that can be Good (el buen amor) or Fool (el loco amor). The Good Love is God's one and is preferred to the Fool's love which only gives men sins. Juan Ruiz gives the reader a lot of examples to explain his theory and avoid Fool love in name of Good one.
Read more about this topic: The Book Of Good Love