You can find two manuals on the general operations of windows 8 here
1. From Microsoft, bit brief, but from the supplier.
Windows 8 1 Product Guide
2. From Dell, much fuller version, from a users point of view.
https://marketing.dell.com/Global/FileLib/Windows_8/windows-8-ebook.pdf
Both are free.

Many manufacturer's only supply a user guide to the hardware and software they provide.
They expect you to go buy a commercial product about how to use the most important bit, the operating system.