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Refer the below trailhead will help you to proceed further on your requirement.
https://trailhead.salesforce.com/content/learn/modules/api_basics/api_basics_rest
https://salesforce.stackexchange.com/questions/201194/expose-data-to-external-system
https://www.apexhours.com/salesforce-integration-with-external-system-interview/
Thanks!!