Accessibility best practices are essential for ensuring that digital content, websites, and applications are usable by as many people as possible, including those with disabilities. 
Here are some key accessibility best practice

1. Use Semantic HTML 

2. Provide Alternative Text for Images 


3. Keyboard Accessibility  
Ensure all interactive elements can be accessed and operated using the keyboard alone. 

•  Each form input field has a corresponding element associated with it using the for attribute. This helps screen readers and other assistive technologies to properly identify each form field. 
•  The tabindex attribute is used to specify the order in which the fields are navigated when using the keyboard. Fields with lower tabindex values are navigated to first.  
•  The autofocus attribute on the username field makes it automatically focused when the page loads. 
•  The submit button is also included in the tab order (tabindex="3") so users can submit the form using only the keyboard. 

4. Proper Heading Structure 

5. Video and Audio Accessibility

Avoid using autoplay attribute as it can be disorienting for some users. 

6. Accessible Error Handling 

7. Use ARIA (Accessible Rich Internet Applications) attributes to enhance the accessibility of dynamic content.

8. Regular Accessibility Audits 
This involves periodically reviewing your website's accessibility using tools like Lighthouse (chrome tool), Axe, or manual testing by people with disabilities.