Here are 22 free ebooks and online books covering web development and web infrastructure building. These are somewhat dated, but many are still valuable resources to learn from.

Complete Idiot's Guide to HTML.zip

DHTML Black book.zip

HTML The Definitive Guide 2nd Edition.zip

HTML by example.zip

JacaScript Bible 4th edition.zip

JavaScript Bible golden edition.zip

Perl Quick Reference

Perl Web Programming

CGI Programming On The World Wide Web.zip

CGI programming unleashed.zip

Using CGI Special Edition.zip

MySQL.and.mSQL.eBook

Using Linux As A Router.pdf

Building_Internet_Firewalls.zip

Firewalls_Complete.zip

Apache Server HowTo

Apache Server Surviver

CGI Programming With Perl 5

Javascript

Perl 5

SQL 2nd Edition

TCP/IP 2nd Edition

Check out my post on intelligentedu.com's free training blog for this excellent free, instructor-led online course for AJAX programming. This AJAX course is offered as a free online course on regular basis 2 or 3 times a year and you can register for it any time, and also take it as many times as you want in the future. Of course, if you'd like you can study the AJAX lessons, slides, and materials on your own at any time, without registering.

Free Course on AJAX Programming

Part 1: Introduction

About this guide

• What's new in CSS Level 2, revision 1?
• Who is this guide for?
• What will we cover?
• How to use this guide
• Browser support information

CSS intro

• Where do style sheets come from?
• The W3C
• A history of CSS specifications
• The CSS Mobile Profile
• Why doesn't everyone use CSS?

Why should I use CSS?

What exactly is a style sheet?

• Proprietary CSS extensions
• CSS v HTML

How do style sheets work?

• The parts of a style sheet
• Style sheet syntax

Linking and embedding a style sheet

• Embedding style sheets
• Linking to style sheets

Statements

• @rules
• @import
• @media
• @page
• Comments
• HTML comment tags
• Rules

Part 2: Selectors

Selectors introduction

• What do selectors do?
• Types of selector

Type selectors

• Types of element

Class selectors
 
ID selectors

Descendant selectors

Link pseudo class selectors

Pseudo element selectors

Dynamic pseudo class selectors

Language pseudo class selectors

Child selectors

First child selectors

Adjacent sibling selectors

Attribute selectors

Part 3: Properties

Properties introduction

• What are properties?
• How to read the property guide

Text style properties

• color
• font-weight
• font-family
• font-size
• font-variant
• font-style
• text-decoration
• text-transform

Text layout properties

• letter-spacing
• word-spacing
• line-height
• vertical-align
• text-indent
• text-align
• direction
• unicode-bidi

Background properties

• background-color
• background-image
• background-attachment
• background-repeat
• background-position
• background

Border properties

• Unscrambling the border mess
• border-width, border-top-width, border-left-width, border-bottom-width, border-right-width
• border-color
• border-style
• border, border-top, border-left, border-bottom, border-right

Margin properties

• margin
• margin-top
• margin-left
• margin-bottom
• margin-right

Padding properties

• padding
• padding-top
• padding-left
• padding-bottom
• padding-right

Page layout properties

• Introduction to positioning with CSS
• The big picture
• A note about "layers"
• And <div>s?
• Ways of positioning
• Static positioning
• Absolute positioning
• Fixed positioning
• Relative positioning
• position
• top
• left
• bottom
• right
• width
• min-width
• max-width
• height
• min-height
• max-height
• z-index
• visibility
• overflow
• float
• clear
• clip

Element type properties

• display
• white-space
• list-style-type
• list-style-image
• list-style-position
• list-style
• border-collapse
• border-spacing
• caption-side
• empty-cells
• table-layout

User interface properties

• cursor
• outline
• outline-color
• outline-style
• outline-width
• Values
• Length values
• Percentage values
• Color values
• Keyword values
• Shape values

Part 4: Advanced CSS

Advanced CSS introduction

Cascade and inheritance

• Cascade
• Managing style at large sites using @import
• Specificity
• Inheritance

Generated content

• content
• quotes
• Counters and counter properties
• counter
• counters
• counter-reset
• counter-increment

Media

• The @media rule
• Types of media
• Media specific importing using @import

Printing

• The @page rule
• Page specific properties
• margin, margin-left, margin-right, margin-top, margin-bottom
• Page breaking properties
• page-break-before
• page-break-after
• page-break-inside
• orphans
• widows

CSS Mobile Profile

• Selectors in the CSS Mobile Profile
• Properties in the CSS Mobile Profile

Part 5: Real world CSS

Real world CSS introduction

Tables with CSS

• Standards-based HTML 4.0
• Borders
• Color
• Evening things up

Browser support

• "It doesn't work": a word of warning
• The difficulties: partial support, buggy support, no support
• No support
• Partial and buggy support
• Missing features
• Broken features

Designing for the web

• Introduction
• Same old new medium?
• Controlling web pages
• Why does it matter?
• The way
• Fonts
• Layouts
• Colors
• The journey

Validating

• Validating HTML
• Why validate?
• What is validating?
• So how do I do this?
• Online validators
• Stand-alone validators
• Validate your style sheets