Here is an easy way to update the security of your Gmail account: use your phone for two-factor authentication.
They could do this for a while, but now iPhone owners can also join the party.
The Google Smart Lock app for iOS, as 9to5Google noted, has been updated to allow you to configure your phone as a Bluetooth security key.
Once you set it up for a Google account, logging in to Gmail, for example, will require you to have your iPhone nearby, unlock it and confirm the login (or cancel it if you are not trying to log in).
There are certain requirements for this to work, it only works on Google Chrome, and you must have Bluetooth on both your iPhone and your computer. In addition, your phone must run iOS 10 or later.
These days, two-factor authentication is an essential security measure. Unfortunately, many online services still use SMS by default as a secondary authentication factor, which is quite insecure since it is susceptible to SIM exchange attacks.
The best alternative is to have a physical device that connects to your computer, such as Google's Titan Security Key, while a dedicated authentication application (such as Google Authenticator) is also quite good.
As a physical security key, it should be among the best methods available.
The Smart Lock method described above would make hacking your account quite difficult in most situations, since the hacker would need to get your Google password, your physical phone and be able to unlock your phone (unless it is already unlocked).