2 Columns in a page

Hello,

I think it’s a very simple question, but I start in WordPress and I don’t success to have a page with many columns.
To give you an example, I would like to have a page like the preview page of the Retro-Fitted theme.

For the moment I have a simple page, and in the future I would like a new “canvas” (like archives) to write others datas.

Thank you for your answers ??