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Apex Documentation:
https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_web_services.htm
TrailHead Module:
https://trailhead.salesforce.com/en/modules/apex_integration_services/units/apex_integration_webservice
Here is trailhead link please review it and follow same steps:
https://trailhead.salesforce.com/en/modules/apex_integration_services/units/apex_integration_webservices
and please review this link also:
https://developer.salesforce.com/page/Apex_Web_Services_and_Callouts
Please mark it best if this is helpful.
Thanks
Akshay