You do not need hundreds of shortcuts. These few save time every day. On a Mac, use Cmd wherever Windows uses Ctrl.
Everywhere
Shortcut
Does
Ctrl + C / Ctrl + V
Copy / paste
Ctrl + X
Cut
Ctrl + Z
Undo. The most useful shortcut there is
Ctrl + Y
Redo
Ctrl + A
Select all
Ctrl + S
Save
Ctrl + F
Find a word on the page or in the document
Ctrl + P
Print, or save as PDF
Alt + Tab
Switch between open windows (Cmd + Tab on a Mac)
Windows
Shortcut
Does
Windows key + E
Open File Explorer
Windows key + D
Show the desktop
Windows key + L
Lock the computer when you step away
Windows key + Shift + S
Screenshot a part of the screen
Windows key + V
Clipboard history: paste something you copied earlier
Windows key + .
Emoji and symbols, including ₵
Windows key + P
Projector and second screen options
Ctrl + Shift + Esc
Task Manager, to close a frozen program
Windows key + left or right arrow
Snap a window to half the screen
In the browser
Shortcut
Does
Ctrl + T
New tab
Ctrl + W
Close tab
Ctrl + Shift + T
Reopen the tab you just closed
Ctrl + L
Jump to the address bar
Ctrl + + / Ctrl + –
Zoom in / out. Ctrl + 0 resets
Ctrl + Shift + N
Private (incognito) window
Typing
Shortcut
Does
Ctrl + Backspace
Delete a whole word
Ctrl + left or right arrow
Move by a word
Shift + arrow keys
Select text
Home / End
Start or end of the line
Ctrl + B / I / U
Bold / italic / underline in Word and Google Docs
The Ghana cedi sign
On Windows, the Windows key + . panel has symbols including ₵. On a phone keyboard, press and hold the $ key in the symbols view; most keyboards offer ₵ there.