Gmail settings for Outlook are automatic and manual types. It depends on the version of your Outlook program and email service provider server settings. Email accounts should be decided first whether to configure as a local email or make this outlook email available for your other devices.
Microsoft Office 365 has made it easy to configure Gmail for Outlook. Errors were prone when establishing a connection between old versions.
The simplicity is that they are easy to connect with. You have to add your Gmail account, and Outlook settings are configured by themselves. Two-factor authentication, if added, then you need to confirm it.
Outlook 2019 has an advanced options feature. It comes to the rescue when the settings are not automatic. Provide the correct ports and encryption, and the setup should be accessible as a breeze. Login pop-up error may arise after inter-linking.