Most passwords are too short, too simple and easily hacked. Use a passphrase, if possible, made up of three or four words which mean nothing to anyone else. For example: ‘moon keyboard shack.’ You can add numbers and special characters to it as needed.
Never re-use passwords. This means having a different one for every website or account. To help with this, cyber security researchers suggest the use of ‘password manager’ apps. These create unique passwords or phrases for each site you use and keep track of them for you.