Hi! Feel free to ask questions regarding the starter files here. 

Do I need this?

No these files are here for you to have a easier time setting up multiple BunnyRoll Pages. You do not need to use it.

Can the images on grid (cards) have a diffrent aspect ratio?

If the grid /cards should have a diffrent aspect-ratio edit line 185 in style.css for example to :

aspect-ratio: 4 / 5;  /* portrait */

If you have any more questions please write them here

The sun is shinning outside and I want to go outside now. See ya!