Open QuickTime Player
Click File
Select New Movie Recording
Click the red Record button
Choose your camera and microphone if needed
Click the Stop button when finished
Save the video file
Open Photo Booth
Click the Record Video button
Start recording
Click the Stop button when finished
Save or export the video
Use the Screenshot toolbar
Press Shift + Command + 5
Select Record Entire Screen or Record Selected Portion
Click Record
Click the Stop button in the menu bar when finished
Use a third-party screen recorder if needed
Open the app
Select screen, camera, or audio options
Start recording
Stop and save the video