The most common structural mistake is not a missing section — it is a section in the wrong place. Proof before the promise (a testimonial carousel before the visitor knows what the product is), features before the stakes (a feature grid before the visitor cares about the problem), or a second CTA competing with the first.
The second most common mistake is the filler section: a stats band that exists for visual variety, a team photo that the visitor did not ask for, or a blog preview that sends people away from the page. Every section that does not advance the decision is an exit ramp. Cut it or move it.
If you are unsure whether your structure is working, the fastest diagnostic is to read only the section headings in order. Do they tell a story — problem, solution, proof, action? Or do they read like a feature list with no narrative arc? The headings alone should make the case.
To see exactly which structural layer is costing you conversions, run a free landing page audit — it scores every dimension and ranks them worst-first.