Check the machine-checkable accessibility fundamentals.
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Automated tools catch perhaps a third of real accessibility problems, and we would rather say that than imply a clean result means a compliant site. What they catch reliably is the structural basics, and those are worth fixing first.
They overlap substantially: alt text, heading structure, semantic markup and descriptive link text serve both. Accessibility is not itself a ranking factor.
No, and it should not be presented as one. Automated testing catches roughly a third of WCAG issues. Colour contrast on rendered elements, keyboard traps and screen-reader behaviour all need a human.
In the UK the Equality Act 2010 requires reasonable adjustments, and public sector bodies have specific regulations. Many private organisations are also bound by contract or procurement requirements.
Missing alt text, unlabelled form fields and heading structure. They are the highest-impact and the least work.
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