There are 28 Groups Pre-defined available by default in Tally.ERP9. Once you create company, from Gateway of Tally go to Display>List of Accounts to see all the 28 Groups. These Primary Groups can't be deleted, however, you can rename but it is not suggested.
I reccomand, first you should create List/Chart of Accounts according to your business requirement then you create Groups & Ledgers.
I have created List/Chart of Accounts which may be suitable to all types of business as shown below:
Watch this video to learn in details about the List/Chart of Accounts
In the next chapter you will learn about How to Create Groups