Help making container or box

Hello !! WordPress experts please help!!

I am learning to develop website, taking awesome online courses on HTML, CSS, Creating a Web Site from http://codecademy.com

I have plan to take more online courses on JavaScript and jQurey from the same site.

I have very basic knowledge on HTML, CSS and WordPress, and trying to improve each day. I hope anyone show me the way to do something I can follow that and achieve the result.

Now all I need is your help (your instructions) to create a “box” maybe it is called “container” or something like this, where all the content of the site shows, e.g. navigation bar, header, main content, sidebar, footer etc.
There will be some spaces on both side left and right like this one http://www.kriscarr.com , I have also showed that with red arrow in the image I have uploaded with the post.

I will be happy if anyone help me on the issue.

Thanks in advance!!
Saidur Rahman