Before I learned history, I believed that most of the fields had been cultivated by people, but later I discovered that I'm wrong  Even if it is a task that is very hot explored by people, you should carefully study the existing research results and compare them with some relevant historical materials
And you will find that almost everyone and every piece of history has something that have been neglected by historians, and there are a lot of research gaps
There is still much to be done in the study of history.