Historical records are written in vernacular, which is more difficult. Reading the vernacular helps us to understand that period of history. And as far as the history books I read are concerned, I think the historical records are well written.
The simplified version of the 24 histories of vernacular Chinese, which is really too large. The popular simplified version of the content has been greatly reduced, less than historical records. One advantage of reading this is that you can have a general understanding of the ancient history of China.
Those things in the Ming dynasty, this is an online novel, but it is not nonsense. I finished reading it. The content is very interesting, but. The reason why this book can sweep the market is not only because of its humorous writing, but also because the author lists the sources clearly, introduces the difference between official history and unofficial history in a very rigorous style, and occasionally inserts the contents recorded in foreign history books to supplement the contents recorded in China history books, which is still very good.
Finally, personally, I think it is better for him to read the modern history of China, especially the history from Qing Dynasty to People's Republic of China (PRC). This history has its particularity and should be read well.
This is how I feel. Don't let him see the left-turn vernacular or anything. Too thin is not good. I think we should first have an understanding of history from a big perspective, and then stimulate his interest and inspire him to understand the details himself.