Hello,
 
I am very new to triggers and classes and have recently been assigned a task to populate an Account Status field on the account based on the related contract status.  I have researched this and came across another post with the same question so I have tried to mirror this. 
 
I have created a checkbox labeled Active_Contract__c on both the Account and Contract objects.  I would like the trigger to set the Active_Contract__c to true on the account if there are any related contracts where the Active_Contract__c is also set to true.  If all contracts related to the Account turns to inactive (false) then I would like to set the Active_Contract__c to false on the account.
 
I found the below trigger but I think I will need to create a Class as well.  Again, I am very new to this and any help would be much appreciated.
 
 
trigger OnAccountCreated on Contract(after insert, after Update) {

    Set<Id> setAccountId = new Set<Id>();   

    List<Account> lstToUpdate = new List<Account>();

    for(Contract rec : Trigger.New)

    {

        setAccountId.add(rec.AccountId);

    }

    List<Account> lstAccount = [SELECT Id,(SELECT Id FROM Contracts WHERE Active_Contract__c = true),Active_Contract__c FROM Account Where Id IN:setAccountId];

    for(Account acc : lstAccount)

    {

        if(acc.Contracts.size() > 0 && !acc.Active_Contract__c){

            acc.Active_Contract__c = true;

            lstToUpdate.add(acc);

        }

        else if(acc.Contracts.size() == 0 && acc.Active_Contract__c)

        {

            acc.Active_Contract__c = false;

            lstToUpdate.add(acc);

        }

    }

         Database.update(lstToUpdate);
}
 
Thanks,

Aaron