Yes, you must know how to choose documents and materials. An excellent paper should not just be a pile of irrelevant materials, but should be based on sufficient and reliable literature research results, which can deeply analyze problems and put forward new ideas and viewpoints. When selecting files, we should pay attention to the following aspects:

1. Select authoritative and reliable periodicals, books, monographs and other documents published through formal channels. These sources are academically reliable and help to improve the academic level of the paper.

2. Choosing the correct literature related to your own research topic should focus on the research topic of the paper, which is helpful to accurately analyze the problem and put forward reasonable conclusions.

3. Choose rich and non-repetitive documents. When every document is the same content or the same research results, it is easy to produce repeated and invalid research conclusions. Choosing diversified documents can better support the theme of the paper.

4. Literatures with the same research topic but low quality or little relevance can be appropriately eliminated, so as to reduce the citation of invalid research conclusions in the paper and reduce unnecessary space. To sum up, knowing how to choose documents and materials, choosing regular, reliable, rich in content and highly relevant documents and materials will help the paper reach a better academic level.