How to Screen Record on MacOS with QuickTime Player

Launch QuickTime Player (built into MacOS 10) through Applications > QuickTime Player
Right click the icon and select "New Screen Recording"
From the newly launched window, click the arrow next to the record button to adjust Microphone and Cursor options during the recording.
Click the Record button to begin screen recording.
Click the screen to record full screen or drag a window to record the items within the window to begin screen recording.
Once finished screen recording, click on the stop button at the top of the screen to end your recording.
To save your screen recording, press "⌘S" and select a destination for your screen recording.