Awk Quick Reference - by Bruce Barnett
Awk - A Tutorial and Introduction - by Bruce Barnett

AWK Reference (pdf)

Gawk manual

Yet Another Boring Developer's Blog - Parse log files with AWK April 08, 2020
<packt>hub - Regular expressions in AWK programming: What, Why, and How

GitHub - wernsey/d.awk An Awk script to generate documentation from Markdown comments in C/C++/Java/JavaScript/C# source code. mdown.awk can create HTML from Markdown.