how to monitor home data usage on MacBook air

Hi there itsaboutmail,

It appears that you'd like to keep track of how much data your MacBook Air is using, and we're glad to provide assistance.

View network activity in Activity Monitor on Mac - Apple Support -- You can view your network activity in the Activity Monitor. This page of the Activity Monitor User Guide shows you how. I you'd like daily information, you'll need to record how much was used at the end of the day. Once you turn off your Mac, the amount is reset back to zero.

Feel free to get back to us with any questions or problems you may have.

All the best.