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trigger AddRelatedRecord on Account(after insert, after update) {
    List<Opportunity> oppList = new List<Opportunity>();
    
    // Add an opportunity for each account if it doesn't already have one.
    // Iterate over accounts that are in this trigger but that don't have opportunities.
    for (Account a : [SELECT Id,Name FROM Account
                     WHERE Id IN :Trigger.New AND
                     Id NOT IN (SELECT AccountId FROM Opportunity)]) {
        // Add a default opportunity for this account
        oppList.add(new Opportunity(Name=a.Name + ' Opportunity',
                                   StageName='Prospecting',
                                   CloseDate=System.today().addMonths(1),
                                   AccountId=a.Id)); 
    }
    
    if (oppList.size() > 0) {
        insert oppList;
    }
}

trigger AddRelatedRecord on Account(after insert, after update) {
    List<Opportunity> oppList = new List<Opportunity>();
    
    // Get the related opportunities for the accounts in this trigger
    Map<Id,Account> acctsWithOpps = new Map<Id,Account>(
        [SELECT Id,(SELECT Id FROM Opportunities) FROM Account WHERE Id IN :Trigger.New]);
    
    // Add an opportunity for each account if it doesn't already have one.
    // Iterate through each account.
    for(Account a : Trigger.New) {
        System.debug('acctsWithOpps.get(a.Id).Opportunities.size()=' + acctsWithOpps.get(a.Id).Opportunities.size());
        // Check if the account already has a related opportunity.
        if (acctsWithOpps.get(a.Id).Opportunities.size() == 0) {
            // If it doesn't, add a default opportunity
            oppList.add(new Opportunity(Name=a.Name + ' Opportunity',
                                       StageName='Prospecting',
                                       CloseDate=System.today().addMonths(1),
                                       AccountId=a.Id));
        }           
    }

    if (oppList.size() > 0) {
        insert oppList;
    }
}

//Syntax
trigger TriggerName on ObjectName (trigger_events) {
  code_block
}

// Example

trigger HelloWorldTrigger on Account (before insert, after insert, after delete ) {
  if (Trigger.isInsert) {
    if (Trigger.isBefore) {
      for (Account a : Trigger.New) {
    a.Description = 'New Description';
      } else if (Trigger.isAfter) {
        // Process after insert
      }
    }
    else if (Trigger.isDelete) {
      // Process after delete
    }
  }
}