how to connect second monitor to macbook?
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Make sure that your external display is turned on and connected to your Mac. Choose Apple menu  > System Preferences, click Displays, then click the Arrangement tab. Make sure that the Mirror Displays checkbox is selected.
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['Connect your second monitor to your computer using the spare graphics card port. ... ', 'Click "Start," then "Control Panel," then scroll down to the "Appearance and Personalization" settings. ... ', 'Click the "Multiple displays" drop-down menu and click "Extend these displays."']
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Buy an Adapter (If Needed) For example, if you have an older monitor with a VGA connector, you can purchase a USB-C to VGA adapter and connect your monitor to one of your iMac's Thunderbolt 3 (USB-C) ports. You can purchase adapters from Apple or from third-party retailers.
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[' Right click your mouse.', ' Select one of the following options based on your needs.', ' Select Multiple displays drop-down list.', ' Select Extend these displays or Duplicate these displays.']
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You may be able to connect more than one display to your Mac. To do so, you need a video cable for each display. You might also need an adapter. After you connect the displays to your Mac, you can choose whether to use them as an extended desktop or for video mirroring.
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Set up the displays for video mirroring Video mirroring shows the entire desktop on each connected display. On your Mac, choose Apple menu > System Preferences, click Displays, then click Display. Set both displays to the same resolution. Click Arrangement, then select Mirror Displays.
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Press the "Start" button and select "Control Panel." Type "display" in the search box near the top-right corner of the window. Click "Connect to an external display." The default setting under "Multiple displays" is "Duplicate these displays." This mirrors your laptop screen onto the monitor.
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['Right-click on the desktop and choose Properties.', 'Choose Settings.', "You'll see a second screen. Drag it to a position similar to where your laptop screen is.", 'It should prompt you if you want to enable this monitor. Say Yes.', 'Make sure Extend my Windows desktop onto this monitor is checked.', 'Press apply.']
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['Connect to computer 2 with USB VGA and HDMI cable. [00:22]', 'Connect the keyboard. [00:47]', 'Monitor 1. [00:55]', 'Connect the power cable. [01:00]', 'Turn in the power button. [01:03]']
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iMac as second display All you'll need is a Mini DisplayPort or Thunderbolt compatible MacBook, iMac and the appropriate cable to connect the two. The cable will need to be plugged into the Mini DisplayPort or Thunderbolt port on your Macbook, and then again in the corresponding port on the iMac.
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Arrange Your Displays With your external display(s) connected, launch System Preferences > Displays. On your primary display (i.e., your MacBook or iMac screen), click the “Arrangement” tab. All detected displays are visible on the diagram. Click and hold on a display to show a red outline on the corresponding monitor.
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['Connect laptop to external display using connection cable.', 'Right-click any empty area of your desktop.', 'Click Screen resolution.', 'Click on the Multiple displays drop-down list.', 'Select one of the following:']
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Connect your Mac to your TV Connect one end of the video cable (or an adapter, if necessary) to the computer's Thunderbolt port , HDMI port, or DVI port , then connect the other end of the cable to the TV's video input port.
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['Connect a VGA display or projector: Use a USB-C VGA Multiport Adapter to connect the display to a Thunderbolt 3 (USB-C) port on your MacBook Air.', 'Connect an HDMI display or HDTV: Use a USB-C Digital AV Multiport Adapter to connect the HDMI display or HDTV to a Thunderbolt 3 (USB-C) port on your MacBook Air.']
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Connect the monitor cable from the second external monitor to the video port on the USB video adapter. If the connectors do not match, use the adapter plug that comes with the video adapter to match the connector on the monitor cable. Power on the second external monitor.
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On your Mac, choose Apple menu > System Preferences, click Displays, then click Display. Set both displays to the same resolution. Click Arrangement, then select Mirror Displays.
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Single Cable, Dual External Displays The only Apple supported method for running two traditional external displays (HDMI, DisplayPort, Mini DisplayPort, DVI or VGA), in addition to power and data, with a single connection to a MacBook is by using specific models of Thunderbolt 3 tethered docking stations.