I am not Japanese but I do know how to say thank you. You can say arigato, or if you would like to say it formal: arigato gozaimasu, which leans more towards thank you very much. If you need help with how to pronounce I suggest you watch some videos. Gozaimasu is a common ending found in a lot of phrases such as Ohio gozaimasu which I may be mistaken but
Means good
Morning or good afternoon. Just start with the common stuff like formal endings, another is desu but I
Forgot the exact meaning of that.
