This user manual is for both spouses. The mistake of one can never turn into a quarrel with the understanding of the other. On which occasion, what to say, what not to say, how to keep a situation under control, both should be understood.
I hope ‘The user manual of a happy husband-wife will prove to be a unique gift for your married life. Believe it, if you understand this user manual and adopt it in your married life, then your married life will be better than before.