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.

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 share your Mac screen with others, you can choose the appropriate method according to different scenarios. First, through video conferencing tools such as Zoom, click the "Share" button to select the screen or a specific window for sharing; second, use Messages or FaceTime to initiate a screen sharing session, click the " " to select "Screen Sharing" and invite the other party to view or control it; third, use the "Screen Sharing" App that comes with the system to enable this function on the target Mac and connect to the server address through Finder to achieve remote access; in addition, you need to pay attention to details such as permission settings, privacy protection and network performance impact.

When the Mac's USB port cannot work, you can try the following methods to troubleshoot problems in turn: 1. Check the connection problem, confirm that the cable and equipment are normal, and clean the interface; 2. Restart the system and check the USB device status in the system report; 3. Reset the SMC and NVRAM (PRAM) to solve potential system abnormalities; 4. Check the system permission settings and device compatibility; 5. Check the hardware damage. If the interface does not respond or the appearance is damaged, professional repairs may be required. In most cases, it can be solved by cleaning, restarting or system adjustment. If it is invalid, hardware failure will be considered.

To find the Library folder on your Mac, you can follow the following steps: 1. Open the Finder window; 2. Click "Go" in the top menu bar; 3. Press and hold the Option (?) key to make the "Library" option appear; 4. Click to enter the Library folder. This folder contains subfolders such as application support files, caches, preferences, logs, and keychains, and is suitable for debugging applications, clearing caches, or managing extensions. If you need frequent access, you can run the "chflagsnohidden~/Library/" command through the terminal to make it permanently displayed. If you hide it again, use "chflagshidden~/Library/".