With the leading up of Gmail's on it's 15th birthday last year, the organization Google added a lot of productivity & also the machine learning tools for it's email service.
It has been a bit confusing to navigate some of it's Gmail features. According to this tutorial, we need to focus on Gmail's auto-completion tools Smart Reply & Compose has been designed to save time.
Enabling Smart Reply & Smart Compose
This feature has been allowed to generate responses & email text, you have to opt from the Settings menu. On the Desktop, you have to click on the gear icon which is on the upper right corner & find the Settings page. Secondly, you can scroll down to the separate Smart Reply & Smart Compose options to choose "On" for either or both to enable the automated suggestions.
Finally you can also choose to allow Gmail's machine learning to personalize those suggestions i.e., based on the way you can write your emails by choosing "Smart Compose personalizations". Let say when you greet your colleagues with the message "Hi team" or "Hello everyone", it will automatically drop as whatever you use most often.
This is all about Smart Reply & Smart Compose