I've been told to "never, ever do image resizing using HTML".
A bit of searching online shows me that "Never upload an image and allow your browser to resize it for you. When you input height and width tags on a large image to make it appear smaller (a mistake many novice WordPress users make), the image still loads first – then browser resizes it, so this won’t help with page load times".
But can anyone shine some light on to how I do that in wordpress? I don't know if I am doing this or not?!!
Many thanks in advance!