This light gray section is just notes for the person creating your site.
You can add all of your school calendars to one website page and/or you can create separate pages for each calendar.
Teachers are able to add each of these calendars to their calendars and use the layer option to turn calendar layers off and on., but I like to add each of them on a separate page because sometimes teachers want to get an overall look at a specific calendar without turning their layers on and off. This is just an extra option I wanted to show you.
Below is a list of different calendars you might want to create using your Master School Account
You can set the share settings for your calendar to default to a certain view whether it be montly or agenda list. Play with options to find which works best for you.