Learn seo online!

1 robots.txt

Robots.txt is a text file that you place on your website (as robots.txt), that instruct  search engines (Yahoo, Google, Bing.. etc), which pages on your website should not be crawled. It is a very import file for seo, if you do not put such a file in your website, your whole content in your website will be crawled by search engines spider, And if your robots.txt is not edited properly, search engines spider  will fail to crawl your website or even public your private of your website.  So robots.txt is very important for your website.

2 Sitemap
A site-map is a separate HTML page that acts as a directory of the pages on your website. A site-map is not only good for getting search engine spiders to follow your page links and easily crawl your entire site, it’s a useful tool for your visitors easily to the content that they want. There are many tools that can make it done .

3 301 redirect
301 redirect is the most efficient and Search Engine Friendly method for webpage redirection. As we know your website link in your website or other website will be display as www.example.come or example.com
but as for google there are difference between each other, so your page rank separate to www.example.come and example.com if you do not do 301 redirect work.

do 301 redirec work is simple, method as follows:
set your .htaccess file (in your root file )
RewriteEngine on
RewriteCond %{http_host} ^mydomain.com [NC]
RewriteRule ^(.*)$ http://www.mydomain.com/$1 [L,R=301]

4 404 error ,Static url, check deadlinks for you and so on

Try to create a 404 error page for your website , give a link to your homepage, it is not so wise  if you redirect your 404 erro page to your homepage , or  your homepage will not be indexed .