A class in business etiquette should be taught at all business colleges.
To not be dirty
Etiquette classes are offered by prestigious boarding schools. I am not sure where you could take an actual class at, though I know you could find some tips on proper etiquette online, on a website such as E-How.
Its called Netiquette...
§Protocols are the standards of etiquette in your place of employment
Using proper etiquette on the Internet, including in e-mails, is called "Netiquette".
Etiquette has evolved differently in each society, ethnic and national and religious and class of humanity. Please and thank you and smiles are the most universal means of expressing the intention to follow good etiquette in every place and strata of society.
The Code of Chivalry .
For your class project on business etiquette, consider interviewing a human resources manager or a corporate trainer who specializes in professional development. These professionals often have extensive experience in workplace behavior and can provide valuable insights into the nuances of business etiquette. Alternatively, a business consultant with a focus on organizational culture could also offer practical perspectives on how etiquette impacts workplace dynamics.
Netiquette
If you have no cooth, you should take a class in manners or read Emily Post's Book of Etiquette.
Etiquette