trigger coursetrigger on Account (after insert, after update)
{
if((trigger.isinsert||trigger.isupdate) && trigger.isafter)
{
    list<contact> lstcon = new list<contact>();
   for(account acc:trigger.new)
       {
          course__c c1= new course__c();
           if(acc.course_name__c == c1.name)
           {
               contact con= new contact();
               con.LastName='pa';
               con.AccountId=acc.id;
            lstcon.add(con);
           }
      if(!lstcon.isempty())
      {
          insert lstcon;
      }
       }

}
}