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http://www.sfdc99.com/2014/11/04/how-to-create-an-apex-class/
Welcome to this vibrant Salesforce developer community.
You can start programming in apex in following ways and is most preferrable,
https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/
https://developer.salesforce.com/trailhead/trails
Please mark this as the best answer if this helps