trigger to insert, update and delete records in contact when account is created

Hi Akshata,

I am giving you a sample of the code. You can take references from it.

Case 1: Insert

trigger InsertContact on Account (after insert)
{
    List <Contact> cntLst = new List<Contact>();
        for(Account acc: Trigger.New)
        {
            Contact cnt = new Contact();
            cnt.LastName = 'chirag'+''+ acc.name;
             cnt.AccountId=acc.id;
            cntLst.Add(cnt);
         }
             insert cntLst;
}

Case 2: Update 

trigger accountcontat on Account (after update){
   List<Contact> contactList = new List<Contact>();
   List<Contact> contactList1 = new List<Contact>();
for(Account acc: [SELECT Id,(SELECT Id,checkbox__c FROM Contacts) FROM Account WHERE Id in: Trigger.new]){
   If(acc.Contacts.size()>0){
     contactList.addAll(acc.Contacts);
    }
}
for(contact c:contactList){
       c.checkbox__c=true;
       contactList1.add(c);
}
update contactList1;
}

Case 3: Delete

trigger deleteAccountRecord on Contact (after delete) {
    RecordType donorRecType = [SELECT ID FROM RecordType WHERE sObjectType = 'Contact' AND DeveloperName = 'Donor_Contact'];
    if(Trigger.isDelete){
        List<ID> accIds = new List<ID>();
        for(Contact contactToDelete: Trigger.old) {
            if (contactToDelete.RecordTypeId != donorRecType.Id ) {
                    contactIDList.add(contactToDelete.AccountId);
            }
        }
       List<Account> DelAccountRecordList = [select id from Account where Id IN:accIds];
        if(DelAccountRecordList.size() >0){
           delete DelAccountRecordList ;
        }
     }
  }

Please let me know it is working for you or not,

Please mark it as the Best Answer if it helps you.

Thank You