1. Reading and marking: First, you need to read and understand the contents of each document. In the process of reading, you can take some notes, such as marking important information, or writing down your thoughts and questions.

2. Classification: Literature can be classified according to subject or research method. For example, if your research is about climate change, you can put all the documents about climate change together.

3. Make a summary: For each document, you should make a brief summary to summarize its main points and findings. This will help you to consult and quote documents quickly when writing.

4. Indexing: You can make a document index, listing the title, author, publication year, publishing house and other information of each document. This can help you find the documents you need quickly when writing.

5. Use document management software: There are many document management software that can help you organize and manage documents, such as EndNote and Mendeley. These softwares can automatically import literature information, generate bibliographies and even provide citation management functions.

6. Update regularly: You should update your literature database regularly, add new literature and delete outdated literature. This will ensure that your document library is always up to date.

7. Copyright protection: When using other people's research results, we must respect the copyright and quote correctly. This is not only a respect for the original author, but also an important means to avoid plagiarism.