Chapter Titles: Are Chapter Names Mandatory?
The "mandatory" first rule of writing is that everything is as mandatory as it is optional. Writers learn the rules so they can break the rules. Writers keep to traditions because they can further them in untraditional ways. Whether debating whether to write a prologue or rely on a character discovering a documented past, there are no "correct answers." The same applies to titling chapters versus leaving them numbered. Nowadays there are factors that will end up answering thi