Here are many links to online guides or tools that the DCP recommends to help build accessibility into your documents
Web (HTML) pages
WAVE Web Accessibility Evaluation Tool from WebAIM
Create and verify PDF accessibility (Acrobat Pro DC)
U.S. Department of Health & Human Services' Guide on How to Tag PDFs
Microsoft Office
Use the Accessibility Checker in Microsoft Office (Windows, Mac 2016)
Find and fix accessibility issues in Word 2016 (Video)
More videos on Word 2016 Accessibility
Make your Word documents accessible (Windows, Mac, iOS, Android, Word Online, Windows Mobile)
Make your PowerPoint presentations accessible (Windows, Mac, iOS, Android, PowerPoint Online)
Make your Excel spreadsheets accessible (Windows, Mac, iOS, Android, Excel Online)
Make your Outlook email accessible (Windows, Mac)