Doors that stop latching in August are a search query, and it should land on your site
The single most useful piece of content a North Texas window and door company can publish has nothing to do with windows.
North Texas sits on expansive clay. It swells when it takes on water and shrinks when it dries out, and the slab above it moves with it. The Texas Department of Licensing and Regulation publishes a technical bulletin on foundations built over expansive soils, and researchers at the Texas A&M Transportation Institute treat shrink-swell ground as a standing regional problem. It is engineering, not folklore.
For a homeowner, that engineering shows up as a door that drags on the jamb, a window that will not slide, or a gap of daylight at a corner. So they search the symptom. They type the thing that is happening in their house, not the product that might fix it.
Write the page that answers it straight. Explain what foundation movement does to an opening, why a rough opening can rack out of square, and what a replacement unit can and cannot correct once the frame is no longer plumb. Say clearly that where the question is structural it belongs to a licensed engineer, and that you will tell them so on site rather than sell around it.
Two things follow. The page ranks, because almost nobody in the trade writes it honestly, and the calls that come off it are pre-sorted. Some become jobs after the slab question is settled. Others you refer out, which is worth more to your reputation in Lakewood or Preston Hollow than a forced sale.