From Calendar:
Click the event, then click Join Hangouts Meet.
From Meet:
Join a scheduled meeting or use a meeting code.
Start a video meeting
Learn the different ways to start a video meeting, such as from a Calendar invite, a web browser, or your phone.
Join a video meeting
Learn the different ways to join a video meeting, such as from a Calendar invite, meeting link, or conference room.
Add people to a meeting
Learn the different ways to add people to a video meeting, such as from a Calendar invite, Meet, or a phone.
Customize video meetings
Share resources in a video meeting
Getting Started
Setting up a Google [Hangouts] Meet
How to Share Your Screen in Google Hangouts
New adaptive meeting layouts & Live captions in Hangouts Meet