The Windows 10 operating system builds on the touchscreen features that were introduced in Windows 8 and 8.1, but achieves a better compromise between touchscreen devices and desktop PCs (using keyboard and mouse) than its predecessor. If you are upgrading from Windows 7 or a previous version, you should find that transition easier with Windows 10 than with Windows 8 or 8.1. In particular, the Start Menu has been returned in the Desktop view.
During these course notes, we shall refer to Windows 10 running in Tablet Mode and in Desktop Mode.