AI Alignment Intro Materials are posts that help someone get oriented and skill up. Distinct from AI Public Materials is that they are more "inward facing" than "outward facing", i.e. for people who are already sold AI risk is a problem and want to upskill.

Some basic intro resources include:

Stampy's AI Safety Info (extensive interactive FAQ)
If Anyone Builds it Everyone dies (book by Eliezer Yudkowsky and Nate Soares)
Scott Alexander's Superintelligence FAQ
The MIRI Intelligence Explosion FAQ
The AGI Safety Fundamentals courses
Superintelligence (book)