What specific areas of etiquette are covered in your etiquette certification courses, and how does the curriculum ensure a well-rounded understanding of social and professional decorum? Additionally, could you explain the assessment process involved in the certification courses, and how it ensures that individuals have mastered the essential etiquette skills and knowledge? Lastly, can you provide examples of how individuals who have completed your etiquette certification courses have leveraged their certification to enhance their career prospects or establish successful etiquette consulting businesses?