From http://www.w3schools.com (Copyright Refsnes Data)

You Have Learned XSLT, Now What?

XSLT Summary

This tutorial has taught you how to use XSLT to transform XML documents into other formats, like XHTML.

You have learned how to add/remove elements and attributes to or from the output file.

You have also learned how to rearrange and sort elements, perform tests and make decisions about which elements to hide and display.

For more information on XSLT, please look at our XSLT reference.

XSL includes 3 languages: XSLT, XPath and XSL-FO, so the next step is to learn about XPath and XSL-FO.

XPath

XPath is used to navigate through elements and attributes in an XML document.

XPath is a major element in the W3C's XSL standard. An understanding of XPath is fundamental for advanced use of XML.

Without any XPath knowledge, you will not be able to create XSLT documents.

If you want to learn more about the XPath, please visit our XPath tutorial.

XSL-FO

XSL-FO describes the formatting of XML data for output to screen, paper or other media.

XSL-FO documents are XML files with information about the output layout and output content.

If you want to learn more about XSL-FO, please visit our XSL-FO tutorial.