There is a lot to learn about making your website content accessible to customers with disabilities. WCAG 2.0, 2.1, & 2.2 standards (https://www.w3.org/WAI/standards-guidelines/wcag/) set the best-practice internationally. The ultimate reference is probably this list provided here https://www.w3.org/WAI/WCAG21/quickref/ with the target being A & AA requirements for most websites.
Why Accessibility is Important
Accessibility is required in some locations but more to the point, it is about making it easier for those with disabilities to use your website. The standards can be summed up in the following major categories:
Perceivable — using text and other methods to make it easier for your content to be seen or heard.
Operable — making it possible for those with disabilities to navigate and use your content.
Understandable — ensuring the meaning is clear and helping a user to avoid or correct mistakes as they use your website forms and content.
Robust — making it easier for the tools used by people with disabilities to read, understand, and operate your site now and in the future.
A lot of this is based on the content which is unique to each website and the design of the site. That means that you, as the site owner, need to take an active role to review your current compliance, improve areas you can, and put in place an active program to make your content accessible. A scan using a tool like this one can help with specific feedback https://www.webaccessibility.com/.