Ever want to know more about how more about Forensic Handwriting?
A great place to begin may be a comprehensive report offered by NIST: Forensic Handwriting Examination and Human Factors: Improving the Practice Through a Systems Approach.
Note: It is a comprehensive 246 page report and recently published (Feb 2020). However, even if only looking for an introduction, it may offer some great insights about the conventional process in Chapter 1 alone.
Full Paper here: https://nvlpubs.nist.gov/nistpubs/ir/2020/NIST.IR.8282.pdf