Do not share your card or Banking information over the phone or internet with anyone, irrespective of whether you know them or not.
Always memorize your card and PIN numbers, and in case of any loss or theft, report immediately to the concerned bank so that they can temporarily freeze your account and prevent any further unauthorized transaction until you receive your card replacement.
While using an ATM, ensure that no one is watching your finger movement as you type your PIN. Watch out for cameras within the premises that can easily capture your PIN number. Try and cover your hand while you type in the PIN.
While making payment at a merchant location or service provider like restaurants, etc, insist on punching in your PIN rather than hand over your card for processing the payment. Download banking apps directly from the bank website and avoid using links that you receive via email or SMS to download your banking app.
Never save your card password in a regular folder in your computer hard drive or email account. If the account gets hacked, there is every possibility that an unauthorized transaction will take place.
Do not share MPIN with anybody (not even with bank), and be suspicious of unknown callers claiming to be from your bank.