prestashop 1.7 grid layout

[r0x]

Hi,

I'm in the process of understanding how to use Prestashop 1.7. I've spent some time playing with default theme "Classic" 1.0.0. I did not understand how the grid system exactly works. My intention is to have two columns layout on the home page. Where I put a list of categories (category tree links module) in the left (small) column and products (like favorite products) go to the right column (which takes the rest of the space). I tried to play with layouts and positioning (design/positions) but I only succeeded in putting the category tree links module into the left column (displayLeftColumn hook). I tried right column in layouts to put favorite products there but doesn't work. Or the default prestashop 1.7 theme doesn't have rightColumn hook ? so that's why I can't insert module there ? 
thank you