This intense chapter contains lots of information. However, it touches only the tip of the iceberg as far as what is possible with XSLT. It should provide you with a functional understanding of how to implement macros using XSLT in Umbraco and more. You can now:
Access published content using XSLT and XPath.
Understand the makeup and structure of an XPath statement.
Display images and file paths via XSLT and GetMedia().
Access Umbraco-specific content by using for loops and examining the content cache via <xsl:copy-of …/>.