This reference volume consists of revised, edited, cross-referenced, and thematically organized selected articles from Software Diagnostics Institute (DumpAnalysis.org + TraceAnalysis.org) and Software Diagnostics Library (former Crash Dump Analysis blog, DumpAnalysis.org/blog) about software diagnostics, root cause analysis, debugging, crash and hang dump analysis, software trace and log analysis written in December 2019 - July 2020 for software engineers developing and maintaining products on Windows and Linux platforms, quality assurance engineers testing software, technical support, escalation and site reliability engineers dealing with complex software issues, security and vulnerability researchers, reverse engineers, malware and memory forensics analysts. This volume is fully cross-referenced with volumes 1 - 12 and features: - 9 new crash dump analysis patterns with selected downloadable example memory dumps, - 15 new software trace and log analysis patterns, - Introduction to diagnostic analysis gestures, - Introduction to the category-theoretic view of debugging, - Lists of recommended category theory, number theory, and cybersecurity books.