Advice for a noobie

So here’s a link.
https://preview.webflow.com/preview/joes-blank-site-bdc24d?utm_medium=preview_link&utm_source=dashboard&utm_content=joes-blank-site-bdc24d&preview=e0a4a2a33ccf9e4050c4a73caa7c27cf&mode=preview

[edit: it is the page in my project called new test,not the home page]

I haven’t added any parallax yet, just dropped 9 placeholder images in to the section, and adjusted the z depth to make ABC behind DEF behind GHI.
When I look at the other breakpoints the images stay the same size, so it doesn’t appear to be responsive. Feel like I’m falling at the first hurdle but if you can see what I’m doing wrong I’d be grateful for your continued advice,
thanks again
Joe