These are copied from an article by Bob Rankin:
Shortcuts for Cursor Positioning
Press the Ctrl key all by itself (once or several times) and a circular indicator will appear on the screen where the mouse cursor is positioned. I use this ALL THE TIME, because I'm always losing track of the mouse curcor. If this doesn't work, see this page to enable this feature.
Ctrl+right-arrow moves the cursor to the beginning of the next word in a document
Ctrl+left-arrow moves the cursor to the beginning of the previous word in a document
Ctrl+down-arrow moves the cursor to the beginning of the next paragraph
Ctrl+up-arrow moves the cursor to the beginning of the previous paragraph
Shortcuts for Selecting Items
Ctrl+Shift with an arrow key selects a block of text one word at a time
Shift with an arrow key lets you select individual items at random
Delete key or Ctrl+D deletes the selected item(s) to the Recycle Bin
Shift+Delete deletes the selected item(s) without moving them to the Recycle Bin
Shortcuts for Undo and Redo
Ctrl+Z: undoes the last action
Ctrl+Y: redoes the last undone action
Shortcuts for Function Keys
F1: displays context-sensitive Help files and opens the Search Help dialogue box.
F2: renames the current item
F3: opens the Search dialogue to find a file or folder
Miscellaneous Useful Shortcuts
Alt+Tab: cycles through the open applications
Alt+Enter: displays the Properties of a selected item
Alt+F4: closes the current application or window
Alt+Spacebar: opens the shortcut menu for the active window, i. e., Restore, Minimize, Close...
Ctrl+Shift+Esc: opens the Windows Task Manager
Ctrl+Mouse Wheel: changes the zoom level
Windows Logo Key Shortcuts
Few users know the function of the Windows Logo key (also called the Start button), which bears the four-part Windows logo. It actually activates a whole new set of keyboard shortcuts:
Windows key opens the Start menu
Windows key + A: open the Action Center.
Windows key + D: displays the desktop
Windows key + E: opens File Explorer
Windows key + I: Open the Settings menu.
Windows key + L: locks your computer or lets you switch users
Windows key + M: minimizes all open windows
Windows key + Shift + M: restores all minimized windows
Windows key + Ctrl + M: open the Magnifier app
Windows key + R: open the Run dialogue box
Windows key + U: open the Ease Of Access Center
Windows key + V: open the Clipboard app
Windows key + X: open the secret Start menu. (Try it!)
Windows key + .: open the Emojis window
Windows key + Up Arrow: maximize selected window.
Windows key + Down Arrow: minimize selected window.
Windows key + Pause key: display the System Properties dialogue box
Windows key + PrtScn: take a screenshot
Windows key + Shift + S: open the Snip and Sketch tool