As far as the computer is concerned, there are two or three settings that we must perform. First of all, since we are talking about the Raspberry Pi Zero W board, the default password is raspberry, so obviously you need to change that to something more secure with letters, numbers, and symbols.

We can do this with the passwd command. Using a terminal, type:

    passwd  

You will be prompted to insert your current password. After this, you have to insert the new password twice. Now, if you exit and log in again, your password must have changed. Note that changing your password requires further actions if any kind of code or automation has been done in other script files.