1. Don't repeat negative opinions (even negations). A politician made a bad response to his scandal accusation, saying "I'm not a liar". This sentence has been bothering him and he can't get rid of it. When answering a question, don't repeat the negative part of the question. For example, someone asked, "Is your company desperate?" Avoid answering "No, we didn't put all our eggs in one basket". Imagine how bad it would be if the headline of the media report was "The CEO said, no, our company didn't put all the eggs in one basket".
Don't judge this question, just answer it. We often hear the speaker say, "This is a good question." This may be a delaying tactic, trying to buy some time to think about the answer, or it may be a sincere response to the questioner's thoughtful question. But for whatever reason, the evaluation question makes people feel superior. Your role is to answer questions, not to judge the audience. If you say that some questions are well asked, does it mean that other questions are not well asked? Just answer them.
3. Don't speculate. Suppose someone asks you the exact number. If this data is confidential, or you are not sure about the specific data, then don't guess. You can say, "We haven't released this data yet, but what I can tell you is …" If you don't know this data, you can say, "I'm glad to find this data for you.