We are going to pass parameter from Parent Component to Child component using Aura Method.
Salesforce Best practice to use Aura Method to pass values from Parent to Child Component
Step 1: Create ParentCmpForAuraMethod.Cmp and add below code.


Step 2: Create ChildCmpForAuraMethod.cmp and add below code. Add Aura Method and two attribute inside it.


Final Output As Below:

