This document provides tips for creating online materials that are accessible to people with disabilities in accordance with the Americans with Disabilities Act (ADA). It discusses designing content that is perceivable, operable, understandable and robust for people with visual, hearing, cognitive and mobility impairments. Specific tips include using sufficient color contrast, descriptive alt text for images, semantic HTML5 elements, skip navigation links, closed captions for videos and testing content in screen readers. The goal is to design content that can be accessed by all users from the start rather than adding accommodations later.