Hi everyone, what is the difference between authentication, legalizing, and notarizing when it comes to US Diplomas and transcripts for a non B visa to teach?

My plan is to have my Bachelor's degree and transcripts legalized at the US consulate here in Hong Kong, and then authenticated/legalized at the Thai consulate after. Is this correct, or do I need to notarize also?

Many thanks!

To change to non-b, teaching in Thailand it requires: 5.5 The Applicant’s educational degree certificate (must be translated into Thai or English and certified by local or overseas Embassy or Consulate of the foreigner and by the Legalization Division, Ministry of Foreign Affairs of Thailand). What I understand from this is that I would first translate my original degree and then certify it by my embassy. Would this also include my transcript?