If the notes share valuable life lessons, readers can apply them to their own lives. It gives a perspective on family relationships which might be inspiring. Also, if it shows the author's struggles and how they overcame them, it can encourage readers to face their own challenges bravely.
Since I don't know the specific 'notes for my son real story', it could be about things like how to be a good person, advice on dealing with difficulties, and the importance of relationships. Maybe it has stories from the father's own youth to guide the son.
Another possible theme might be growth and self - improvement. The father could be giving advice on how the son can grow into a better person, like learning from mistakes, being persistent in achieving goals, and constantly seeking knowledge. This is a common theme in notes where a parent wants to impart wisdom to their child.