Shop by need
Most people don't shop by category — they shop by problem. Pick what applies to you.
Browse by problem
Category or need — which should you shop by?
Shop by category when the activity is the constraint. If you need a boot that survives a wet trail or a flat shoe to squat in, the category page is the faster route, because the requirement comes from what you're doing rather than from your feet.
Shop by need when your feet are the constraint. Width, arch collapse and heel pain cut across every category — someone with wide feet needs a wide fitting whether they're buying running shoes or work boots, and a stability shoe is a stability shoe regardless of what it's marketed for. Starting from the problem stops you filtering by activity and then discovering nothing in the list comes in your fitting.
If both apply, start here and narrow by category afterwards. Fit constraints eliminate far more shoes than activity does, so applying them first leaves you a shorter and more honest shortlist.
A note on the health-related pages
Plantar fasciitis, flat feet and knee pain are conditions, not shoe categories. Footwear is one factor among several and no shoe treats or cures anything. Those pages explain what a shoe can plausibly change and what it can't, and they say plainly when the answer is to see a podiatrist rather than buy something. We'd rather lose the sale than pretend a purchase is a treatment.