Generate a full detail guide on Americans with Disabilities Act (ADA) compliance for small businesses. The guide must be practical and clear. It should include: 1. A section on website accessibility (WCAG), with a checklist for common issues like alt text for images and keyboard navigation. 2. A section on physical store accessibility, with a checklist for ramps, aisles, and restrooms. 3. An explanation of why accessibility is good for business. 4. A list of resources for further help. Please include a strong disclaimer that this is not legal advice and an accessibility expert should be consulted.