There isn't any specific free materials as far as I am aware. You can review the How To Videos at:
https://video.sas.com/category/videos/how-to-tutorials
Look through here:
https://www.sas.com/en_gb/certification.html?gclid=EAIaIQobChMIx4SO5rWX3wIVUuR3Ch2jcgYrEAAYASABEgJAgfD_BwE
And get various books on the subject.
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