When I took the chance to rewrite the book, one of the goals was to improve the image quality. Though much has changed in LaTeX since 2011, so I also worked on the actual content and code.
After 10 years, Internet addresses changed, some services are gone and new services appeared. I also could get rid of parts of the publisher’s Beginner’s Guide style (that he used for a lot of IT books earlier) such as quiz sections. Sectioning changed a lot when we compare the table of contents, it’s now really more LaTeX focused and not strictly following some book series style guide. In 2011, I was young and had to strictly follow the style guide to get the book contract that time.
There’s a lot of small improvements too, perhaps I go through and list them on a separate page later on here.
Of course the installation guide has been rewritten, and there's now an extensive review of the Overleaf online LaTeX service. The chapter about online material has changed completely.
With the second edition, I made the website
LaTeXguide.org for the readers, with all code examples, that can be compiled on the website without needing a local LaTeX installation. That website shall also provide errata, improvements, updates, any additional information.
Stefan