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Step 1: Visit Salesforce Exam Registration Step 2: Signup/Login to Salesforce account Step 4: Select Date, time and confirm with the payment method

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For more info read reference:

Salesforce DEX-450 Certification leaning site Salesforce DEX-450 Certification resources

Salesforce DEX-450 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Describe common limit issues and security concerns
  • Launch a Visualforce page using a custom button
Topic 2
  • Write tests for action methods, getters, setters, and properties
  • List the differences between the ways you can invoke DML operations
Topic 3
  • Visualforce Development Considerations and Testing
  • Determine what data an Apex class can access
Topic 4
  • Process the result of a query in Apex
  • Understanding Record Types
  • Use trigger context variables
Topic 5
  • Describe practices for writing code that is easy to maintain and extend
  • Write triggers and classes that assume batches of data as input
Topic 6
  • Write a basic query using Salesforce’s query language, SOQL
  • Write Apex to invoke DML operations and handle DML errors

Reference: https://trailhead.salesforce.com/en/academy/classes/dex450-build-applications-programmatically-on-the-salesforce-platform/

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