There’s a second edition: https://www.awk.dev/

Everyone should read "The AWK Programming Language". It's so short, with both the first and second editions floating around 200 pages in an A5 (could be off on that page size) form factor.

Aside from AWK being a handy language to know, understanding the ideas behind it from a language design and use case perspective can help open your eyes to new constructs and ideas.