On 4/24/2019 I passed my AWS Developer Associate Certification
I studied for a couple weeks and I work with AWS heavily currently.
I had a bunch of Kinesis streams, how to secure S3 and Lambda, Lambda with IAM peppered in there.
On-line Course - A Cloud Guru
Practice Tests
Links
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https://medium.com/devopslinks/passing-the-aws-certified-developer-associate-exam-c83c894cb780
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https://www.udemy.com/aws-certified-developer-associate-practice-tests-dva-c01/learn/v4/overview
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https://www.whizlabs.com/blog/aws-developer-associate-exam-questions/