If you are a beginner writer or need to polish your skills please check out the Fiction University. Their aim is:
“To show writers ways to build a solid foundation for their writing”.
http://fiction-university.com/
I’m writing a historical novel and came upon the following sites:
The History Quill
Recommended: https://thehistoryquill.com/how-to-write-historical-fiction-in-10-steps/
A Writer of History
7 Elements of Historical Fiction