How best to migrate Apps & Data from Win10 PC to new Win11 PC

A more straightforward approach is to clone the old Windows 10 drive to the new Windows 11 computer. By doing so, you can boot with my existing Windows 10 setup, retaining all my files and applications. The next steps would involve updating the drivers before transitioning to Windows 11. This method is notably less complicated than it may seem, especially when compared to the hassle of reinstalling every application and transferring data manually. To clone the disk, simply connect the old drive to the new computer, either internally or through a USB adapter, and employ a cloning tool like Macrium Reflect or Acronis. Upon the initial boot on the new machine, be prepared for a slight delay as it installs necessary drivers.

I used a third party backup tool to make a copy of the system, then restored the Windows 10 System to my new PC and then simply did the upgrade with the usual Windows Update functionality.
I used Acronis for it, there's a free version if you own a WD drive.

First, make sure login a Microsoft account on Windows 10 PC. And sync with this account. All apps and microsoft staff will be downloaded to new Windows 11 PC.

For apps downloaded from Microsoft Store, the apps will be synced automatically after sign-in on Windows 11. For non Microsoft apps, you have to download and install manually.