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I just did this challenge as well. What I learned to make it responsive was using flexbox and grid. I used a <picture> element that lets you have an <img> and <source srcset=""> so the browser can use both images depending on the screen size. w3schools.com helps me a whole lot.

Nice try, but it's far from complete. Don't learn just position and media query, there is more to it. My advise is get yourself familiar with flexbox and css grid. This in combination with media query will be more useful in the long run. This doesn't mean you should not learn position, yes throw position also in the mix.