I’d be glad to share some information with you on how closing the books works in QuickBooks Online. info661.
It would really depend on how you'd like to manage your books. Most of the time, small businesses close their books at the end of the year to prevent unwanted changes that could affect their financial reports before filing the taxes. Although, you can also your books on a monthly or weekly basis to easily track and monitor all their business activities within that period.
Whether you’re closing the books at the end of the month or year, the process is the same. A best practice is to collaborate with your Pro-advisor or CPA in reviewing your account and performing the formal closing process to ensure that everything is accurate and up-to-date.
Afterward, you can review your closed books. You can use this article to guide you: Year-end guide and checklist.
You got me if you need more help in reviewing or editing your books.