Accessibility is part of a dependable interface, not a final decoration. Meaningful headings, readable contrast, labelled controls, keyboard access, clear focus, and useful error messages help people complete tasks with different devices and abilities.
Include accessibility in the first flow and test it with real content. Small decisions made during planning are usually easier to maintain than a large repair project after every screen has been built.
Review this topic from a visitor’s point of view as well as from a technical or SEO report. Confirm that the main answer appears early, the next action is clear, the page works on a normal phone, and important content is available in the initial HTML. Then use real enquiries, search questions, and support records to decide what to improve next.