.. -*- coding: utf-8; -*-

==========
 WEB SEO.
==========
.. contents::
   :local:

General search engines
======================

Major search engines are:

* https://google.com from Google Co.
* https://bing.com from Microsoft Co.
* https://yahoo.com or https://search.yahoo.com/ from Yahoo Co and it uses Bing
  engine.

Major local search engine are:

* https://yandex.com from Yandex Co that have large market on Russia, Ukraine, Belarus.

SEO tips
========

* Use pain text rather than images, CSS, JavaScript, Flash, SilverLite or other
  technologies for important content.

* Make sure your site work without with CSS, JavaScript, Flash, Java, etc
  disabled. Check your site with screen reader or text browser (lynx, w3m).

* Avoid HTML frames and iframes.

* Market your site so other sites link to yours.

* Tend to focus on single topic per page.

* Avoid cryptic URLs. Craft human attractive URLs as URL words directly can be
  indexed. Use dashes instead of spaces.

* Shutdown mirrors or use ``link rel="canonical"`` tag to point to page on main
  site.

https://support.google.com/webmasters/answer/139066
  Use canonical URLs
https://en.wikipedia.org/wiki/Canonical_link_element
  Wiki article.

Informing search engine about site structure
============================================
::

  http://www.example.org/sitemap.xml
  http://www.example.org/robots.txt

robots.txt
==========

Start line with ``#`` to commet it out.

Disable all robots (that respect ``robots.txt``)::

  User-agent: *
  Disallow: /

To allow all robots complete access::

  User-agent: *
  Disallow:

To allow a single robot::

  User-agent: Google
  Disallow:

  User-agent: *
  Disallow: /

All valuable search engines support ``Allow`` and ``Sitemap`` tags::

  User-agent: *
  Allow: /
  Sitemap: http://example.com/sitemap1.xml
  Sitemap: http://example.com/my_sitemap2.xml

The longer path the higher priority of ``Allow`` and ``Disallow`` tags.


http://www.robotstxt.org/orig.html
  Original specification. Only ``User-agent`` and ``Disallow`` tags supported.
http://robotstxt.org.ru/
  Russian followup to http://www.robotstxt.org
https://developers.google.com/webmasters/control-crawl-index/docs/robots_txt
  Google extension specification.
https://yandex.ru/support/webmaster/controlling-robot/robots-txt.xml
  Yandex extension specification.
http://en.wikipedia.org/wiki/Robots.txt
  Wiki article.

meta robots
===========

Instruction to not index current page::

  <meta name="robots" content="noindex">

Instruction to not follow links on current page::

  <meta name="robots" content="nofollow">

Pair combinations::

  <meta name="robots" content="noindex, nofollow">
  <meta name="robots" content="noindex, follow">
  <meta name="robots" content="index, nofollow">
  <meta name="robots" content="index, follow">

rel nofollow attribute in link
==============================

To prevent spam on forums and blogs or to including commertial links::

  <a href="http://spam.com/sale/20-off" rel="nofollow">You win 100$!!</a>

https://support.google.com/webmasters/answer/96569
  Use rel="nofollow" for specific links.
https://support.google.com/webmasters/answer/81749
  Ways to Prevent Comment Spam.
https://en.wikipedia.org/wiki/Nofollow
  Wiki article.
https://codex.wordpress.org/Nofollow
  Wordpress suggestions.

sitemap
=======

* http://en.wikipedia.org/wiki/Sitemaps
* http://www.sitemaps.org/

Alexa.
======

Statistics (most useful Top Search Queries):

  http://www.alexa.com/siteinfo/DOMAIN

Google.
=======

  http://www.google.com/trends

Yahoo.
======

Give backlink (this page redirect to siteexplorer.search.yahoo.com):

  linkdomain:DOMAIN -site:DOMAIN