After all, this is about academic norms!
Mathematical Translation of China Academy of Sciences
In mathematics education:
Journal of Mathematics Education
Mathematics teaching research
Mathematical bulletin
Mathematical communication
Books on the history of mathematics:
Katz's General Theory of Mathematical History
Li Wenlin's introduction to the history of mathematics is easy to understand.
Klein's ancient and modern mathematical thoughts are also very classic.
Books on mathematical culture:
The Origin of Mathematics and the Beauty and Reason of Mathematics by Peking University and Zhang Zhu.