What kind of answer is a quality answer? Is there any standard?

The criteria for a good answer are as follows:

Accuracy: The answer must be based on facts and evidence and correct.

Comprehensiveness: The answer should contain all relevant information so that readers can fully understand it.

Readability: the answer should be expressed in concise and clear language, so that readers can understand it easily.

Relevance: The answer must be relevant to the problem and help solve it.

Timeliness: provide readers with answers as soon as possible to help them solve problems.

The above are general standards, but sometimes they may be different due to special circumstances. Generally speaking, high-quality answers should be accurate, comprehensive, readable, relevant and timely.