Actually, it's not difficult. Understand the topic of interest first, and it is best to be accurate (narrow the scope, it is easy to miss points if it is too big). Next, look for information, especially the information with wide research scope and difficult data collection. Be careful! At the same time, it is best to link with professional theoretical knowledge.
If you are ready in the early stage, the paper will be half finished. I compare writing a paper to building a house: the positioning of a paper is like frame design, site selection and foundation laying; Data collection is like buying materials; The outline of the topic is like building a framework, and writing a paper is just a brick. The key is the first two steps. As the saying goes, a clever woman can't cook without rice.
If you don't know how to write, you can refer to other people's papers, and the excellent papers of seniors can be collected online.