Here is an excellent free online book covering XML, how to use it and what's it all about. Its titled Sams Teach Yourself XML in 21 Days and provides hundreds of real-world situations on how to use XML, along with showing you the newest tools you can use to get the most of it. The linked table of contents is below.


Table of Contents for Sams Teach Yourself XML in 21 Days

  » About the Author
  » Acknowledgments
  » We Want to Hear from You!
  » Introduction

  » Part I: At a Glance
  » Day 1. Welcome to XML
  » Day 2. Creating XML Documents
  » Day 3. Creating Well-Formed XML Documents
  » Day 4. Creating Valid XML Documents: DTDs
  » Declaring Attributes in DTDs
  » Day 6. Creating Valid XML Documents: XML Schemas
  » Day 7. Creating Types in XML Schemas
  » Part I. In Review

  » Day 8. Formatting XML by Using Cascading Style Sheets
  » Day 9. Formatting XML by Using XSLT
  » Day 10. Working with XSL Formatting Objects
  » Part II. In Review

  » Part III: At a Glance
  » Day 11. Extending HTML with XHTML
  » Day 12. Putting XHTML to Work
  » Day 13. Creating Graphics and Multimedia: SVG and SMIL
  » Day 14. Handling XLinks, XPointers, and XForms
  » Part III. In Review

  » Part IV: At a Glance
  » Day 15. Using JavaScript and XML
  » Day 16. Using Java and .NET: DOM
  » Day 17. Using Java and .NET: SAX
  » Day 18. Working with SOAP and RDF
  » Part IV. In Review

  » Part V: At a Glance
  » Day 19. Handling XML Data Binding
  » Day 20. Working with XML and Databases
  » Day 21. Handling XML in .NET
  » Part V. In Review

  » Appendix A. Quiz Answers

Here is a free online JavaScript book, Sams Teach Yourself JavaScript in 24 Hours. This book will teach you how to effectively use and code JavaScript in your web pages. Using JavaScript is a relatively easy method to give your website more user interactivity and make it easier and more friendly to use. Sams Teach Yourself JavaScript in 24 Hours provides many step-by-step lessons that you can use to learn both scripting basics and the details of the JavaScript scripting language


Table of Contents of Sams Teach Yourself JavaScript in 24 Hours

  » About the Author
  » Acknowledgments
  » We Want to Hear from You!
  » Reader Services
  » Introduction

  » Part I: Getting Started
  » Hour 1. Understanding JavaScript
  » Hour 2. Creating a Simple Script
  » Hour 3. How JavaScript Programs Work

  » Part II: Learning JavaScript Basics
  » Hour 4. Using Functions and Variables
  » Hour 5. Using Strings and Arrays
  » Hour 6. Testing and Comparing Values
  » Hour 7. Repeating Yourself: Using Loops
  » Hour 8. Using Math and Date Functions

  » Part III: The Document Object Model (DOM)
  » Hour 9. Working with the Document Object Model
  » Hour 10. Responding to Events
  » Hour 11. Using Windows and Frames
  » Hour 12. Getting Data with Forms
  » Hour 13. Using Graphics and Animation

  » Part IV: Moving on to Advanced JavaScript Features
  » Hour 14. Creating Cross-Browser Scripts
  » Hour 15. Creating Custom Objects
  » Hour 16. Working with Sounds and Plug-Ins
  » Hour 17. Debugging JavaScript Applications

  » Part V: Working with Dynamic HTML (DHTML)
  » Hour 18. Working with Style Sheets
  » Hour 19. Using Dynamic HTML (DHTML)
  » Hour 20. Using Advanced DOM Features

  » Part VI: Putting It All Together
  » Hour 21. Improving a Web Page with JavaScript
  » Hour 22. Creating a JavaScript Game
  » Hour 23. Creating DHTML Applications
  » Hour 24. JavaScript Tips and Tricks

  » Part VII: Appendices
  » Appendix A. Other JavaScript Resources
  » Appendix B. Tools for JavaScript Developers
  » Appendix C. Glossary
  » Appendix D. JavaScript Quick Reference
  » Appendix E. DOM Quick Reference

Here is a great free online book, titled Sams Teach Yourself HTML 4 in 24 Hours. This will teach you all about HTML, how to code, how to design your graphics, build your web pages and make them dynamic, and get your site online as fast as possible. It is targeted towards the beginners, but will also be useful for more advanced web site developers. Some of the HTML topics it covers includes the following: How HTML and XML work, Publishing Your Web Pages, Text Alignment and Formatting, HTML Forms, Web Page Graphics, Backgrounds and Colors, Page Design and Layout, Graphical Links and Imagemaps, Advanced Layout using Tables, Using Style Sheets, Embedding Multimedia in Web Pages, Interactive Web Pages, Web Scripting, Using Dynamic HTML, and Organizing and Managing a Web Site. A complete HTML 4 Quick Reference is also included in the appendix.


Table of Contents of Sams Teach Yourself HTML 4 in 24 Hours

  » About the Author
  » Acknowledgments
  » Tell Us What You Think!
  » Put Your HTML Page Online Today

  » I. Your First Web Page
  » Hour 1. Understanding HTML and XML
  » Hour 2. Create a Web Page Right Now
  » Hour 3. Linking to Other Web Pages
  » Hour 4. Publishing Your HTML Pages

  » II. Web Page Text
  » Hour 5. Text Alignment and Lists
  » Hour 6. Text Formatting and Font Control
  » Hour 7. Email Links and Links Within a Page
  » Hour 8. Creating HTML Forms

  » III. Web Page Graphics
  » Hour 9. Creating Your Own Web Page Graphics
  » Hour 10. Putting Graphics on a Web Page
  » Hour 11. Custom Backgrounds and Colors
  » Hour 12. Creating Animated Graphics

  » IV. Web Page Design
  » Hour 13. Page Design and Layout
  » Hour 14. Graphical Links and Imagemaps
  » Hour 15. Advanced Layout with Tables
  » Hour 16. Using Style Sheets

  » V. Dynamic Web Pages
  » Hour 17. Embedding Multimedia in Web Pages
  » Hour 18. Interactive Pages with Applets and ActiveX
  » Hour 19. Web Page Scripting for Non-Programmers
  » Hour 20. Setting Pages in Motion with Dynamic HTML

  » VI. Building a Web Site
  » Hour 21. Multipage Layout with Frames
  » Hour 22. Organizing and Managing a Web Site
  » Hour 23. Helping People Find Your Web Pages
  » Hour 24. Planning for the Future of HTML

  » VII. Appendixes
  » A. Readers' Most Frequently Asked Questions
  » B. HTML Learning Resources on the Internet
  » C. Complete HTML 4 Quick Reference
  » D. HTML Character Entities

Here is an excellent free HTML 4 and CSS 2 Reference Help Ebook. It also includes a short step-by-step course to help you on developing your first web page.. Here is the download for this HTML and CSS reference ebook.

Contents:

• CSS 2 overview 
• CSS 2 Syntax
• Sample Style Sheet

• HTML4 Overview                                        
• HTML4 Syntax - by group
• HTML 4 Syntax - Alphabetical
• Color Reference

Here is a blog post I wrote at intelligentedu.com that links to 204 PHP Tips and Tutorials with Scripts at dev.fyicenter.com. The PHP example scripts and techniques demonstrated here will assist you as a beginner or as an experienced PHP web developer. They also include many excellent PHP tutorial exercises.

PHP Tutorial Topics:

• Downloading and Installing PHP for Windows
• Understanding PHP String Literals and Operations
• Built-in PHP Functions for Strings
• Understanding PHP Arrays and Their Basic Operations
• Built-in PHP Functions for Arrays
• Creating Your Own PHP Functions
• Reading and Writing Files with PHP Functions
• Working with Directories and Files with PHP
• Processing Web Forms with PHP
• Understanding and Managing Cookies with PHP
• Understanding and Using Sessions in PHP
• Working with PHP and MySQL Database
• Uploading PHP Pages to Web Servers