Hello. Your question is incomplete, so it is not possible to answer it accurately. However, I will try to help you in the best possible way.
It is only possible to know the theme and support details of your text by reading it. In this case, to answer this question, you must recognize the main theme of your text (which is the main message that the text wants to send). After recognizing the topic, it is possible to find the support details, because these details are additional information that explain or prove the main topic.
Answer:
I think what it means is what kind of impression and feeling they get after reading that they take away from the letter.
Answer:
Cause and Effect When you get nervous about something you think your gonna do bad so you get worried .
sorry that is to many for me to just give you answer