Minnesota's Digital Accessibility Coordinators have created some free training resources. These programs will help you learn how to create content that anyone can use.
A 7-module training on creating accessible documents, While it focuses on Microsoft Word, you can apply its principles to any digital document creation tool, such as Google Docs.
A series of short presentations on the basics of making accessible PDFs.
A series of training opportunities that offer a chance to gain a new perspective by experiencing how people with disabilities use digital technology.