As previously described I have taken the AWS Certified Solutions Architect – Professional exam and passed.
I primarily studied via a Udemy course available through my employer, AWS white papers, and Re:Invent videos available on Youtube.com
My notes, which were primarily taken for myself can be found here: https://github.com/1davidmichael/AWS-Certified-Solutions-Architect-Professional-Exam-Study-Notes
These notes should not be substituted for your own learning and real-world experience but may provide an overview of skills and background knowledge that is needed.