Number of SEO updates from December 2000 to October 4th, 2013

Each year, Google changes its search algorithm around 500–600 times. While most of these changes are minor, Google occasionally rolls out a "major" algorithmic update (such as Google Panda and Google Penguin) that affects search results in significant ways.

Total number of  SEO updates from December 2000 to October 4th, 2013 are

Updates with various names(38)
Panda updates(26 )
unnamed(1)
Penguin updates(5)
Humming bird (1)

Major updates from December 2000 to October 4th, 2013 are

Google Toolbar - December 2000(toolbar introduced)
Cassandra - April 2003(targeted multiple links)
Florida - November 2003(steaming the words)
Jagger - October 2005(duplicate content issues)
May Day - May 2010( looking for higher quality sites)

Panda - February 24, 2011(quality for content major role)
Panda 2.0 (#2) — April 11, 2011 Panda update to all English queries worldwide
Panda -  Google launched Google+ — June 28, 2011 
Panda -  Ads Above The Fold — January 19, 2012

Penguin - "Payday Loan" Update — June 11, 2013
Penguin - In-depth Articles — August 6, 2013
Hummingbird - The name of Google’s new search algorithm 
Penguin #5(aka Penguin 2.1), October 4th, 2013( this update is going to affect 1% of search queries

What should we already know to learn Drupal...

Before you continue, you should have a basic understanding of the following:

• HTML
• Some scripting knowledge

What is PHP?

• PHP stands for PHP: Hypertext Preprocessor
• PHP is a server-side scripting language, like ASP
• PHP scripts are executed on the server
• PHP supports many databases (MySQL, Informix, Oracle, Sybase, Solid,
• PostgreSQL, Generic ODBC, etc.)
• PHP is open source software
• PHP is free to download and use

What is a PHP File?

• PHP files can contain text, HTML tags and scripts
• PHP files are returned to the browser as plain HTML 
• PHP files have a file extension of ".php", ".php3", or ".phtml"

What is MySQL?

• MySQL is a database server
• MySQL is ideal for both small and large applications
• MySQL supports standard SQL
• MySQL compiles on a number of platforms
• MySQL is free to download and use

PHP + MySQL

PHP combined with MySQL are cross-platform (for examplr, you can develop in
Windows and serve on a Unix platform)

Why PHP?

• PHP runs on different platforms (Windows, Linux, Unix, etc.)
• PHP is compatible with almost all servers used today (Apache, IIS, etc.)
• PHP is FREE to download from the official PHP resource:   www.php.net
• PHP is easy to learn and runs efficiently on the server side