I have always believed in the simple ABC principles to keeping safe online. This approach will ensure you challenge everything to keep safe online.
(A) ASSUME Nothing
(B) BELIEVE No-one
(C) CONFIRM Everything
An example, do not assume a website or app is keeping your personal information safe. Therefore do not reuse passwords, etc.
Another example, is confirm the URL, email address, or phone number of a company you deal with, when they ask for personal information. Confirm the contact information independently, do not rely on links or phone numbers provided in emails.
Stay safe and use the principles to keep you safe online.