The trick to getting started in a Google Doc is to open the equation editor in the Google Document under the insert window. There is even a shortcut to inserting an equation without the need of moving the curser to the insert window.
Chromebook Shortcut: Alt + I + E (Alt + I will open the Insert window. E then opens the Equation editor)
Mac Shortcut: Ctrl + Option + I + E (Ctrl + Option + I will open the Insert window. E then opens the Equation editor)
Demonstration of Using the Shortcuts
For example: If I am looking to typing the following equation in a proper math notation in a Google Doc
I would type the following:
y=3\pi(space bar key)x+\frac(space bar key)5(tab key)8
For a better demonstration, watch this short view.
Big Thanks to Rachel for sharing this great resource for students!