Please go through the documentation here :
https://experienceleaguecommunities.adobe.com/t5/adobe-experience-manager/ad0-e126-exam-sample-tests...
https://experienceleague.adobe.com/en/docs/certification/program/technical-certifications/aem/aem-ex...
https://app.rockinfo.com/courses/127
Exam Objectives and Scope
Section 1: Education (22%)
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List relevant AEM features and capabilities
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Recommend how to leverage AEM features to meet business needs
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Apply procedural concepts necessary to conduct training for content editors
Section 2: Architecture (24%)
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Recommend an Information Architecture to leverage AEM Standard Features to meet business needs using on-prem or Adobe hosted (Cloud) environment
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Describe how AEM integrates with third-party services
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Determine how to define roles and permissions
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Describe caching approaches
Section 3: Business Analysis (38%)
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Map standard modules of AEM to different business problems for the customer
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Apply content management concepts for AEM modules
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Identify typical project stakeholders
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Apply procedural concepts necessary to support collaboration of all parties involved
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Determine how to meet the core business goals while remaining within budget and/or scope
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Determine how questions from developers should be answered with respect to the business goals
Section 4: Setup and Implementation (16%)
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Determine how to configure and use content components to show best practices of AEM
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Verify the correct implementation of features, and locate and describe occurring errors
