There are several ways to mirror your screen on a Mac, depending on what device you want to mirror to:

1. Mirroring to an External Display (Wired):

• Connect the Display: Use the appropriate cable (HDMI, DisplayPort, USB-C) to connect your Mac to the external monitor or TV. You might need an adapter depending on your Mac’s ports.
• Access Display Settings:
  • Go to the Apple menu > System Settings (or System Preferences).
  • Click Displays in the sidebar (you might need to scroll down).
• Choose Mirroring:
  • Click on the name of your primary display.
  • Click the “Use as” pop-up menu.
  • Select Mirror for Built-in Display (or the name of your primary display).
  • Alternatively, after connecting the external display, a mirroring option might appear directly in the Displays settings. You can also often find a “Mirror Displays” checkbox.
• Arrange Displays (if needed): If you have multiple displays connected and want to mirror a specific one, you might need to first set them up as an extended desktop. Then, press and hold the Option key and drag one display icon onto another display icon in the Displays arrangement settings to mirror those two displays.
• Quick Toggle: Press Command + F1 (or Command + Fn + F1 on some keyboards) to quickly toggle between mirrored and extended display modes when an external display is connected.

2. Mirroring to an AirPlay-Enabled Device (Wireless):

• Connect to Wi-Fi: Ensure your Mac and the AirPlay-enabled device (Apple TV, AirPlay 2 compatible smart TV) are on the same Wi-Fi network.
• Use Control Center:
  • Click the Control Center icon in the menu bar (it looks like two toggle switches).
  • Click Screen Mirroring.
  • Select your AirPlay device from the list.
  • If prompted, enter the AirPlay code displayed on your TV.

3. Mirroring to Another Mac (Using Screen Sharing):

• Enable Screen Sharing on the Target Mac:
  • On the Mac you want to mirror to, go to Apple menu > System Settings (or System Preferences).
  • Click Sharing in the sidebar.
  • Turn on Screen Sharing. You might want to configure “Computer Settings” to set a password for screen sharing access.
• Connect from Your Mac:
  • Open Finder on your Mac.
  • In the sidebar, click Network.
  • Locate the other Mac in the list.
  • Click Share Screen in the top right corner.
  • You might be prompted for the username and password of the user account on the target Mac.

4. Using Third-Party Software:

• For mirroring to devices that don’t natively support AirPlay or standard mirroring protocols (like some Roku or Chromecast devices), you might find third-party applications that offer screen mirroring capabilities. Search the Mac App Store for terms like “screen mirroring” or the specific device you want to mirror to (e.g., “mirror to Roku,” “mirror to Chromecast”). Be sure to read reviews and understand the software’s functionality and potential costs.

Choose the method that best suits your needs and the devices you are working with. For most external displays, a wired HDMI connection or AirPlay (for compatible smart TVs and Apple TVs) will be the most straightforward options.