a free Intro to FrameMaker course (Unstructured FrameMaker 2020)
Authoring Structured Content in FrameMaker
Formatting Structured Content in FrameMaker
For my paid courses you can choose either the fully online course, or Course+Class, which includes 2 deep-dive sessions after the course to help you with best practices, workflows, and specific questions about your own work.
All my courses (including the free Intro courses) come with a Certificate of Completion. Unfortunately, I don't believe Adobe currently offers a FrameMaker certification. If I recall correctly, the last version I was able to certify in was FrameMaker 11.