How Trial balance works in Dynamics AX?

What is Trial Balance?
The list of ledger accounts and their balances at a given time.
Typically generated at the end of an accounting period.
Debits must equal credits.
Does not prove that all transactions have been recorded or that the general ledger is correct.

Trial balance list page screenshot of Dynamics AX
General Ledger > Common > Trial balance

Debit: 
Debits are recorded against the particular account on the trial balance list page when there is debit transaction done against the particular account.
Transactions can be done from General Journal form etc
Entries to the left side of the account.
Amounts that are owned by you or belongs to you.
Typically increases assets and expenses.
Credit:
Credits are recorded against the particular account on the trial balance list page when there is credit transaction done against the particular account.
Transactions can be done from General Journal form etc
Entries to the right side of the account
Amounts that are owed to others or belongs to others
Typically increases liabilities, equity and revenues

Opening balance:

Closing balance of the previous day.

Formula: 

Opening balance = Beginning balance of  today's date - 1

Closing balance:

Closing balance is the ending balance of the current day.

Formula:

Closing balance = Beginning balance + (Debit - Credit) 

Happy Daxing !