You might find this all too elementary so I am offering a table of links that might be more useful if you have some experience with Windows.
Chances are you have a Windows icon, commonly called WIN, on the bottom row of your keyboard to the left of the spacebar. This calls up the Start Menu.
The key with the icon to the right of the spacebar gives you a list of the most common actions wherever you are in the program you are using.
In Dreamweaver, the web-design program I am using, it looks like this:
The Alt key
I'd also recommend getting to know the following:
Master Explorer Favorites
Taskbar Menu vanishes
Seven ways to make Windows 10 work better
Good piece for showing you neglected shortcuts: The Guardian. 13 June 2019. It covers:
- Put apps on the Taskbar
- Quick access to recent files through right-buttoning Taskbar icon
- Task view / timeline
- Multiple desktops
- Cloud clipboard
- Mousewheel scrolling
Unfortunately the writer does not explain how to achieve many of these tools, unless you are there already. The key is the Task View icon in the Taskbar (a window sandwiched vertically between two partial ones).
Try Windows Ctrl D for desktop for a new one. Switch between them with Windows Ctrl > or <. Instructions from Cnet.
Cloud clipboard (Windows V). Try these guides: techrepublic and windowscentral. You need to get to Settings System Clipboard (start with Windows X). I couldn't find it. My keyboard shortcuts guide.