Key elements of the website
This part should have a punchy cover image, a strong title, a call to action or a short introduction.
Since no two people view the same page on the same resolution device, it's impossible to predict what will appear above the fold for each visitor on a mobile or laptop. The general suggestion is to design the above-the-fold portion of the webpage to be 1000 pixels wide and 600 pixels high, so that it doesn't scroll on smaller (1024x768) resolution screens. This makes it much harder for marketers to squeeze important elements into a much smaller space.
This is why responsive design, where content is flexible to the device (and resolution) it is being viewed on, is needed.