Rel Canonical url Tag Normalization

Canonical Tag Rel Canonical Bing URL Normalization Link Rel

What is Canicaliztion

For example my home page. 4 different adresses

http://buildawebsitehowto.com/
http://buildawebsitehowto.com/index.html
http://www.buildawebsitehowto.com/
http://www.buildawebsitehowto.com/index.html

also sometimes if you look at an analysis tool,
you will find unknow adress such as  http://www.buildawebsitehowto.com/fdavaefedefe%
using canonical code to tell crawlers and search engine index
whitch html address is the right one. 

Put
 <link rel="canonical" href="page URL"/>
into head section of each pages. 

I want to tell crawlers that this url is
http://www.buildawebsitehowto.com the right one.

so it will be
<link rel="canonical" href="http://www.buildawebsitehowto.com"/>