The running-balance column on a statement is the single most useful thing to understand, because it shows the effect of every transaction in order: each payment reduces it, each charge increases it, and the final figure is what you owed at the statement date.
Following it line by line
Start from the opening balance at the top, then read down: a repayment or overpayment reduces the running balance; interest or a fee adds to it. By the last line you reach the closing balance. See the running-balance definition and the transaction list on your statement explained.
Opening and closing balances
The opening balance carries over from the previous statement's closing balance, so the two should always tie together across consecutive periods. If they do not, that is worth querying. See opening and closing balance defined and the summary panel at the top of your statement.
Spotting something odd
If the running balance jumps in a way you cannot account for, trace it to the transaction on that line and check it. See how to check a statement line you don't recognise and I think there is an error on my statement.
Credicorp lends to companies rather than to you personally, so this is business finance outside the consumer-credit regime. That does not change the practical steps below.
See also: The transaction list on your statement explained, Running balance (definition), How to read your statement of account.