HowNet, I think this website is quite famous. When I quit my job, my colleagues told me that they used the same website. Even if they were not writing a paper, it would be useful to look at it and increase their professional knowledge. Take my major as an example, it is a very unpopular major, and there are few related works at present, but it is enough for us to basically refer to it when writing a thesis. We can really see the big picture from a small place and see that the literature on that website is really complete and reliable. However, it is estimated that the average user will have to spend money on documents. When we are students, we can log in according to the ID number and related password of the student ID card, so that we can get the information for free.
There are VIP, mainly Chinese periodicals. Looking for a foreign language, I can't find it on it, so its content is not particularly comprehensive, at least not as comprehensive as HowNet, but it can also be used as a reference.
Wanfang data, this is the dissertation database, which mainly collects dissertations. I think you can use it as a reference to see how others write. After all, sometimes I don't have a very accurate grasp of the structure when I write it myself. It will be much better to have a reference paper.
SCIE database, this is a foreign language. If you want to find some foreign literature, you can search on this website.
Actually, I use HowNet the most. After all, for me, what I need to do is to write the paper up to standard, and I don't want to study it in depth. If you are a college student, you can really ask the counselor if your school's library system has links and permissions to these websites. If you have permission, you can apply for opening with your student number. We applied for it ourselves, so it was free in the end.