Responsive News Homepage.

I enjoyed this one although I thought it would be much simpler than it was.

Questions

• Do I need to concern myself with the site looking perfect at every dimension possible, eg. 768px, 920px, 1100px, 1500px... or is it industry standard to focus on the primary breakpoints?
• For the longest time I didn't realise there was a desktop scaled image that worked much better with my CSS-grid, and before realising this I was struggling to get the image to dynamically fit the grid row and height however couldn't find how to do this anywhere online to my satisfaction.