With modern macOS releases (Mojave and later), Macs have a hidden screen record app with more advanced controls like a timer, save to destination choices, show/hide the mouse pointer, remember last selection, microphone control, and more.

If you mostly do straightforward screen recording on Mac, the native functionality is free with no app to download.

• On your Mac keyboard, press the combination Command + Shift + 5 (can be used while running any app)
• In the bottom middle of the screen, choose the rectangle with a circle icon to record the whole screen or the dotted-line rectangle with a circle icon to record a selection of your screen
• Click the Options button if you’d like to enable the microphone, show mouse clicks, select a save location, and more
• Choose Record to start
• When you’re done, click the Stop button (circle with square icon) in the menu bar found in the top middle/right of your screen
• Your recording will show up on your Mac’s desktop by default unless you picked a different save location

You can also pull up this menu in QuickTime by clicking File > New Screen Recording but the keyboard shortcut is usually faster.