One of the best ways to secure your Gmail account is with two-factor authentication. This article explains how to set it up for your account and why it's so important.
How to Enable 2FA in Gmail – Enable Gmail Two-Factor Authentication
Google makes this really easy. Here’s what you need to do to enable 2FA for Gmail from a desktop browser:
Sign in to your Gmail account and select your profile picture or icon.
Select Manage your Google Account.