To upgrade from Windows 10 to Windows 11, the recommended and easiest method is to use Windows Update if your device is compatible. Here are the steps:

1. Open the Start menu and go to Settings > Update & Security > Windows Update.
2. Click the "Check for updates" button.
3. If the Windows 11 upgrade is available for your device, you will see a message that Windows 11 is ready.
4. Click the "Download and install" button to start the upgrade process.
5. Accept the software license terms when prompted.
6. The upgrade will download and install; your PC may restart multiple times during this process.
7. After installation, you will be running Windows 11.

If Windows Update does not offer Windows 11 yet or your device is not automatically prompted for upgrade, you can use the Windows 11 Installation Assistant or create installation media from the official Microsoft website to manually upgrade while keeping your apps and files. For devices that don't meet Windows 11 hardware requirements, there are advanced methods like using Windows 11 ISO and bypassing hardware checks, but these require more technical knowledge. This general upgrade process keeps personal files, apps, and settings intact while moving from Windows 10 to Windows 11.