Responsive News Homepage

I'd love to get a feedback regarding semantic html here. If i ever become a front-end dev, i'd love to be sure im doing something right but honestly, i don't know how to write markup properly. Is the div on the left aside? Does it contain articles? Same with the main content on the left, is it an article? Same with footer, that's what i wrapped 3 divs on the bottom in at least, are they each an article or?...