Accessibility improves when it is treated as a design constraint from the beginning rather than a repair project at the end.
Start with structure
Use semantic headings, landmarks, buttons for actions and links for navigation. Correct structure makes the page easier to understand for both people and assistive technology.
Make interaction visible
Every keyboard-accessible control needs a visible focus state. Forms need labels and useful error messages. Accordions should communicate their expanded state and remain operable without a pointer.
Motion should have an off switch
Reduced-motion preferences should remove unnecessary movement without removing content or functionality. Hover effects must never be the only way to discover an action.
Accessibility is ongoing practice. Test with a keyboard, inspect contrast, use real content and include people with different needs in the feedback process whenever possible.