Learn the Basics
Google Meet Official Cheat Sheet: Google's own produced sheet.
G Suite Learning Center: Meet - Learn all there is to know in this training site. Google has put together a really robust class, with links to each topic, cheat sheets, videos, and topics segmented into Level 1, Level 2, and Level 3 complexities.
This website is excellent and provides step-by-step instructions, self-paced modules, videos, and even a cheatsheet.