Turn on two-factor authentication for everything you can.
If there is one quick win to prevent hackers accessing your bank accounts, shopping apps, social media profiles, email accounts or smart home devices - it is two-factor authentication (2FA).
2FA is the second layer of authentication in addition to your password, to ensure you are the genuine owner of the account being accessed. It usually takes the form of a single use code that you can receive by email, SMS or through an app. Some authenticator apps are capable of more sophisticated multi-factor authentications - considering contextual information such as the device being used, location, app being accessed, etc. - allowing the user authentication to be a simple push to approve or thumbprint scan.
Lots of applications and services have the ability for 2FA but it is generally turned off by default. Turning this on will increase your security profile massively.