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1) https://developer.salesforce.com/trailhead/module/apex_integration_services?utm_campaign=trailhead&utm_source=sfdc&utm_medium=chatter-success
Apex Integration Overview
https://developer.salesforce.com/trailhead/apex_integration_services/apex_integration_callouts
This module will Describe the differences between web service and HTTP callouts and Authorize an external site with remote site settings
Apex REST Callouts
https://developer.salesforce.com/trailhead/apex_integration_services/apex_integration_rest_callouts
This module will describe about Perform a callout to receive data from an external service and Test callouts by using mock callouts
Apex SOAP Callouts
https://developer.salesforce.com/trailhead/apex_integration_services/apex_integration_soap_callouts
This module will describe you about Generate Apex classes using WSDL2Apex and Perform a callout to send data to an external service using SOAP with Test callouts by using mock callouts
Apex Web Services
https://developer.salesforce.com/trailhead/apex_integration_services/apex_integration_webservices
This module will Describe the two types of Apex web services and provide a high-level overview of these services. Create an Apex REST class that contains methods for each HTTP method and Invoke a custom Apex REST method with an endpoint
REST API
http://amitsalesforce.blogspot.in/2016/04/rest-api-in-salesforce-execute-rest-api.html
Enjoy and happy learning :)
Let us know if this will help you
Thanks
Amit Chaudhary