What are the differences between authentication, legalizing, and notarizing US diplomas for a non-B visa to teach in Thailand?

The post asks about the differences between authentication, legalizing, and notarizing US diplomas and transcripts required for obtaining a non-B visa to teach in Thailand. The user plans to legalize their documents at the US consulate in Hong Kong and then authenticate them at the Thai consulate, and seeks clarification on whether notarization is also necessary. Comments provide additional guidance regarding the requirements from the Ministry of Education in Thailand and suggest contacting the school regarding their preferences.