Article Preview Component with Flex, Grid & some ARIA

Determining what ARIA attributes go where can be a little confusing. I named my widget a toggletip in BEM even though it really isn't a pure toggletip (which normally only gives additional info after getting clicked/tapped, rather than opening an interactive menu). I took that into account when determining what ARIA attributes to use and went to something similar as with accessible navigation + a hamburger menu - by using aria-expanded & aria-label on the toggle button as well as aria-controls that points at the menu itself. I wonder how did some of you approach this problem (if you did), and if you can recommend some beginner-friendly resources on ARIA. I found a couple (like Inclusive Components by Heydon Pickering) but I'd love to know more. ARIA spec it self is cool, but feels a little heavy for me.