Apple MacBook Air Retina 13 Inch 2019 Quick Start Guide

To reset the SMC on your MacBook Air Retina 13 inch 2019, shut down your Mac, then press and hold the Shift, Control, Option keys on the left side of the built-in keyboard, along with the power button for 10 seconds. Release all keys and the power button, then press the power button again to turn on your Mac.
First, ensure your MacBook is connected to a reliable power source. Try performing an SMC reset. If it still won't turn on, check for any physical damage or visit an Apple Authorized Service Provider.
You can free up storage by using the built-in Storage Management tool, which helps identify large files and unused apps. Consider moving files to iCloud or an external drive. Regularly empty your Trash and clear cache files.
Use a compatible USB-C to HDMI or DisplayPort adapter to connect your MacBook Air to an external monitor. Once connected, go to System Preferences > Displays to adjust settings and preferences.
Turn off your MacBook and unplug the power adapter. Use a soft, lint-free cloth slightly dampened with water. Gently wipe the screen, avoiding excessive pressure and moisture.
To improve battery life, reduce screen brightness, close unused applications, and disable Bluetooth and Wi-Fi when not needed. Use Safari for browsing and enable battery-saving settings in System Preferences.
Check for software updates and install them. Restart your MacBook regularly, close unnecessary apps, and clear cache files. Consider upgrading RAM or storage if possible, and check Activity Monitor for resource-heavy processes.
Go to System Preferences > Security & Privacy > FileVault. Click the lock icon to unlock settings, then click "Turn On FileVault". Follow the prompts to complete the setup.
Back up your data first. Then, restart your MacBook and immediately press Command + R until the Apple logo appears. In macOS Utilities, select "Disk Utility" to erase your startup disk. After erasing, reinstall macOS using "Reinstall macOS".
Click on the Apple menu, select "About This Mac" and then "System Report". Under the "Power" section, check the "Cycle Count" and "Condition" to evaluate your battery health.