"Thank you! Goodbye!"
If any of you would like to look up the full meanings and uses of individual characters, I can definitely recommend the Han Trainer Dictionary online https://dictionary.hantrainerpro.com/chinese-english/. It's a wonderful resource!
From the information there: 谢 = to thank, to wither, to apologize, to excuse oneself, to thank somebody for something 谢谢 = thank you, thanks, vote of thanks 你 = you, 2nd person singular 再 = again, once more, anew, any more, any longer 见 = to see, to meet, to refer to, opinion, insight, to interview, view, sight, catch sight of, interview
The dictionary also lists additional information on the characters and words, such as audio pronunciation, common words in which the characters are used, words with similar meaning, other characters with the same pronunciation, etc.
谢means thank 谢谢means thank you 再means again 见means see
So basically it's thank you see you again Which is changed to thank you goodbye
I'm a English born Chinese! Xie Xie (谢谢) is Thanks which is informal and should only be used with friends or when something is a small favour.
Xie Xie ni 谢谢你- is literally thanks + you meaning thank you literal translation thanks you.
谢谢 was not accepted, and later in the lesson, 谢谢你 was not accepted! This entire lesson is so riddles with inconsistencies, it it literally the worst I have ever seen. I have never been so infuriated with this site.