i want to clone opportunity object in custom object and then if i insert new opportunity in opportunity object it should get updated in custom object

trigger CloneOpp on Opportunity (after update){
    Custom_Object__c[] ls=new Custom_Object__c[]{};
        for(Opportunity o: trigger.new){
            Custom_Object__c obj=new Custom_Object__c();
            //Assign whichever values you want to clone to the fields of your custom object, for example:
            //obj.name=o.name;
            ls.add(obj);
        }
    insert ls;
}