These days there are three main methods for checking a bank account:
In person at the branch
Telephone banking
Internet banking
The last two methods usually require you to opt-in to the service, and set up login or security details.
Each individual bank will have a slightly different set up, so the best thing to do would be to request more information from your bank.
I personally do all my banking online, and my bank has 2 different apps: One for account management, and another that is meant as a quick way to transfer money over the phone.
I use both, and only go "in -branch" if I absolutely need to.