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Jakson MonteiroJakson Monteiro 

link Opportunity with task

trigger ClosedOpportunityTrigger on Opportunity (before insert,before update)
{
 
    for(Opportunity o: Trigger.new)
    {
     if(o.StageName=='Closed Won')
     {
         Task t= new Task();
         t.Subject='Follow up Task';
        t.whatid=o.id;
           insert t;
     }
        

      
    }
    
    
}
ManojjenaManojjena
Hi Jakson ,

Are you facing any issue ?