To use the iPad as a Mac sub-screen, you can use the Sidecar function. The steps are as follows: First, make sure the device meets the requirements (Mac will run macOSCatalina and above after 2016, and iPad requires iPadOS13 or above); then go to "System Settings" > "Display" on the Mac, click "Add Monitor" and select iPad to connect; if it is unable to connect, you need to check whether Wi-Fi and Bluetooth are on, and make sure the two devices are in the same network environment. In terms of connection mode, wireless is suitable for daily office work but may have delays, while wired is more stable and supports charging. The display mode is divided into two types: extension and mirroring. It is recommended to use extension mode to improve work efficiency. In addition, it can also be achieved through preferences

To share files between two Macs on the same network, first make sure that the two devices are connected to the same LAN, then enable file sharing on the host, set shared folders and access permissions, and then connect from another Mac through the access sidebar or manually enter the SMB address, and finally you can browse, copy or transfer files. Common problems include waiting or restarting the network when the device cannot be discovered. If the permissions are incorrect, you need to check the username, password and sharing settings. If the connection fails, you can try the SMB address. If the firewall blocks, you can temporarily close the test.

iCloud backup is suitable for critical data on iOS devices, while TimeMachine is used for full system backups of Macs. 1. iCloud automatically backs up settings, messages, photos, etc. on iPhone and iPad, but does not include re-downloadable applications and media; 2. TimeMachine requires external storage devices, which can back up the entire Mac system including files, applications and desktop layout; 3. iCloud is more convenient to use in daily life, relying on network and space management, while TimeMachine provides local storage and retains multiple versions of files; 4. Most users use both at the same time to achieve comprehensive data protection.

PrivateRelay is a privacy protection feature launched by Apple that hides user identities and browsing content through encryption and segmentation of network requests. The specific operation is divided into two steps: one is to encrypt the data and forward it through two relay servers. The first is to know the IP and the second is to know the content that does not know the user's identity; the second is to realize privacy isolation, and even Apple cannot obtain the complete record. Supported devices must meet: iOS15/iPadOS15/macOSMonterey and above systems, log in to AppleID and subscribe to iCloud services, and are only available for Safari browser. Its benefits include preventing ISP tracking, no additional settings are required, default activation, etc.; the limitation is that it does not support the wall surfing and only protects Safar.

To free up Mac storage space, you can use three methods to find and process large files: 1. Use the system's own storage management tool to view the "big file" list in "About Native" - ??"Storage"; 2. Set file size and modification time in Finder to search for large files; 3. Use third-party tools such as DaisyDisk, OmniDiskSweeper or GrandPerspective to scan and visualize disk usage. Each method has its own advantages, the system tools are convenient and fast, Finder provides more accurate search options, and third-party software provides stronger analysis functions. Remember to clear the wastebasket after deleting it to avoid remaining space.

When typing on a Mac using a Windows keyboard, the Win key corresponds to the Command key and the Alt key corresponds to the Option key; 1. Understand the key mapping: The Win key replaces the Command key for commonly used shortcut keys such as Command C/V, the Alt key replaces the Option key for special symbol input, and the right Alt key may be mapped to Control or other functions; 2. Adjust the keyboard mapping can be customized through system settings or third-party tool Karabiner-Elements; 3. In terms of function keys and multimedia key support, the F key needs to be used with the Fn key, the default brightness and volume function can be adjusted, and some brand shortcut keys are incompatible and need to be customized; 4. Common shortcut key comparison includes copy and paste.

Latency or lag on a Bluetooth mouse on a Mac is usually caused by a variety of factors, including wireless interference, low battery, system problems, or multi-device connection overload. 1. Wireless device interference: Keep Mac and mouse away from interference sources such as routers, USB3.0 devices, or switch Wi-Fi to 5GHz band. 2. Mouse battery level is insufficient: Check the battery status and replace the battery through the system settings or the mouse’s own indicator light. 3. The system or Bluetooth driver is not updated: Go to system settings to update macOS and try to reset the Bluetooth module through the debug menu. 4. Too many Bluetooth devices: disconnect unused peripherals, or use a Bluetooth USB adapter to share the load. Gradually checking the above problems can effectively solve the phenomenon of mouse lag.

To capture a specific area on your Mac, you can use the system shortcut key Shift Command 4 to enter the area screenshot mode, drag and select the area and release it to save to the desktop; if you need more options, press Shift Command 5 to open the screenshot tool, click "CaptureSelectedPortion" to take the area screenshot, and set the saving path and display the mouse pointer; a thumbnail will appear in the lower right corner after the screenshot, click to edit and mark it, and save it after completion.