Turn on Do Not Disturb: Especially handy during presentations, temporarily silence alerts, calls, and other notifications on your iPhone, iPad or Mac. On iOS devices, swipe up from the bottom of any screen to open Control Center, then select the moon icon. On your Mac, click on the Notification Center icon in the upper right hand corner of your Mac's menu bar. Scroll up. Set Do Not Disturb to On.
Monitor the power usage on your laptop: Click the battery icon in your menu bar. If apps are using lots of energy, you’ll see them listed under “Apps Using Significant Energy.” This is very handy when running on battery power and trying to maximize battery.