There are many scientific websites. Here I mainly recommend some websites that I often visit.
1. Xiaomu Chong Forum (Xiao Mu Chong Forum - the first stop for academic research)
This forum should be known to quite a few people and benefited from it, not only many professional experts but also It can deliver documents, share resources, etc. In short, scientific researchers can visit more and communicate more.
2. Library Genesis
This website is so powerful that many foreign books can be downloaded. Genuine foreign books are too expensive. For poor people like us, we might as well download the PDF version.
3. China Patent Download Network (China Patent Download)
As long as you provide the patent number, you can basically download the patent you need.
4. China National Knowledge Infrastructure (CNKI) and Web of science
One of these two websites is for checking Chinese literature, and the other is a must-have website for checking English literature. Study it carefully. How to search for documents, the function is very powerful. There are many other websites for literature search and download, such as Wanfang, springer, and even Google Scholar, etc., but I think these two websites are very comprehensive for literature search, and once you learn to use them, it is easy to learn to use the others.
5. Data Analysis Network (Selected Data Analysis)
This website is mainly about big data queries and practical software skills. It is more practical. The modeling, SPSS, Matlab and other knowledge used when writing papers can be found on this website.
6. Nutshell
This is not actually a scientific website. It mainly contains some knowledge sharing, some scientific news, etc.