AWS Certified Developer Associate Certification is not a hard Certification but certainly is not very easy. But for preparing, you need the following:
- Quality video material not hours of waffle. This will provide the base understanding.
- Quality lab exercises with quality documentation.
- Identification of the individual sections of the AWS documentation that you required to know and testing on that knowledge.
There are several training courses to clear this certification exam. I recommend this AWS Developer Associate Certification course by Intellipaat to clear the AWS Certified Developer Associate certification.