Course for beginners
Windows is a complex operating system. Beginners are sometimes confused over many problems of Windows. So, to make it clearer, I wrote these articles.
As Windows are a series of operating systems developed by Microsoft, and Microsoft's first operating system was MS-DOS, so let me talk from the older operating system ---
MS-DOS.
If you want to dig deeper into the working mechanism of Windows and MS-DOS, I recommend that you learn programming first. This will raise your understanding level of operation systems by a large extent. If you want to dig directly into operating systems, you can read books about them, with the help of books about the Intel 80x86 CPU series.