i need to learn or i need to know if there is any site that can give the basic understanding of matrix. in the school i attended there is know good math teacher so this caused an effect to me. please i need help!

You might try here:

http://mathworld.wolfram.com/Matrix.html

 

 

...or, even here:

http://en.wikipedia.org/wiki/Matrix_%28mathematics%29

Once you get a grasp of the basics, you can always post more specific questions in the maths section.

 

The other website I like is http://www.planetmath.org