Learn how to mirror or project another device's screen to your Windows PC using Miracast. Follow the steps for Windows 11 or Windows 10 to install the Wireless Display app or the Connect app and select the device you want to cast to.

Learn how to play different formats of audio and video files with Media Player and codecs. Find out which codecs are included with Windows and which ones you can install from the Microsoft Store.

Learn how to find your BitLocker recovery key in Windows 11 or 10 when you are prompted to enter it. The recovery key is a 48-digit number that helps unlock an encrypted drive.

但如果需要测试多个条件，例如我们假设所有条件都需要为 True 或 False (AND)，或只有一个条件需要为 True 或 False (OR)，或者如果想要检查某个条件是否不 (NOT) 符合你的条件，这时该怎么做呢？这三个函数均可以单独使用，但它们更常见于与 IF 函数成对使用。

Learn how to create a USB flash drive or DVD to install or reinstall Windows 11, 10, 8.1, or 7. You'll need a reliable internet connection, a blank storage device, and a product key (if applicable).

Learn how to download and install Microsoft 365 or Office 2019, 2016, or 2013 on your PC or Mac. Find out how to activate Office, troubleshoot issues, and switch languages or bit versions.

Learn how to use the IF function with AND, OR, and NOT functions in Excel to make logical comparisons between values and return results. See examples, formulas, and tips for conditional formatting with these functions.

Learn how to install the Media Feature Pack for Windows 10/11 N to restore media features such as Windows Media Player, Movies & TV, Skype, and more. Find out the prerequisites, update information, and excluded features of this optional update.

Learn how to set your preferred web page as your home page in different browsers, including Microsoft Edge, Internet Explorer, Google Chrome, Firefox, and Safari. Follow the steps for each browser to customize your home page settings.

Learn how to use PC Health Check app to check your device health, performance, and Windows 11 eligibility. Find out how to install, update, and troubleshoot the app from Microsoft Support.