Week Eight Homework

handleAfterInsert

    public static void handleAfterInsert(List<Account> newAccounts){
        
        Id runningUserId = UserInfo.getUserId();
        String userEmail = [SELECT Email FROM User WHERE Id = :UserInfo.getUserId()].Email;

        List<case> CasesToAdd = new List<case>();
        for (Account a : newAccounts) {
            Case c = new Case();
            c.Status = 'New';
            c.Origin = 'New Account';
            c.Subject = 'Send Welcome Package';
            c.AccountId = a.Id;
            c.Description = 'Please follow up with this new Account and send them a Welcome Package.';
            c.Staff_Email_Address__c = userEmail;
            casesToAdd.add(c);
        }
            insert casesToAdd;
        }

Opportunity Trigger and Handler

//Opportunity Trigger
trigger opportunityTrigger on Opportunity (before insert) {
opportunityTriggerHandler.handleAfterInsert(Trigger.new);
}

//Opportunity Handler
public class opportunityTriggerHandler {
    public static void handleAfterInsert(List<Opportunity> newOpps){
        
        //When an Opportunity is inserted, check and see if this account has a rating of 'Hot'.  If not, make it 'Hot'
        //since we consider any account with an open opportunity as hot
        
        //Get a map of account records that have opportunities in this trigger
        //In order to do this, we first need a set of the Account Ids
        Set<Id> accountIds = new Set<Id>();
        for (Opportunity opp : newOpps) {
            accountIds.add(opp.accountId);
        }
        //Now we can get the map
        Map<Id, Account> accountMap = new Map<Id, Account>([SELECT Id, Rating FROM Account WHERE Id IN :accountIds]);
        
        //Finally, a set to hold any accounts we're updating (we use a set, because it's possible to have multiple opportunities being
        //inserted for an account and they would then get added to the list twice.  We'll convert this set back to a list before doing DML )
        Set<Account> updatedAccountsSet = new Set<Account>();
        
        //ok, now we loop through and update as needed
        for (Opportunity opp : newOpps) {
            //get the account record for this opportunity
            Account acct = accountMap.get(opp.AccountId);
            if (acct.Rating != 'Hot'){
                acct.Rating = 'Hot';
                updatedAccountsSet.add(acct);
            }
        }
        
        if(updatedAccountsSet.size()>0){
          List<Account> updatedAccountsList = new List<Account>();
          updatedAccountsList.addAll(updatedAccountsSet);
         update updatedAccountsList;
        }
}
}

Very good job,

Line 2 - should be after insert instead of before insert
Good use of set - you could also just use the set for accountId and updatedAccountsSet to be a list instead
Minor for indentation , please use ctlA +File =>Fix indentation

Keep being amazing!