Instructional Design Resources
The X factor: The Secret to Better Content Marketing
These slides "break" some of the rules I generally recommend. For example, there's a lot of text on each slide, multiple (and fancy) font types, and patterned backgrounds. But it more or less works. Proof that there's an exception to every rule...
Accessibility for Teams
A ‘quick-start’ guide for embedding accessibility and inclusive design practices into your team’s workflow. The site is specifically for people working on government websites, but they're good standards for all websites (even if you're not "legally" required to be accessible... you really ought to be).