The humble keyboard should be your primary input device. It is possible to navigate the Windows GUI with only a keyboard. There are many instances where keyboard shortcuts are preferable to reaching for a pointing device. The less time you spend reaching for your mouse and then locating your mouse pointer on the screen (or screens), the better!
In this post:
QWERTY
The standard layout for most English keyboards is the QWERTY layout.
This layout is named after the first six letter keys on the keyboard and has been around since 1873 [1] — far longer than the computers it now graces!
Shift
The Shift key is used in combination with other keys. Holding down Shift and pressing a letter results in the upper case letter.
See also the Keyboard section of the post Navigating the Word environment
Caps Lock
If you discover you have typed text in CAPS in Word, use the Toggle Case feature.
If the Caps Lock key is switched on (it toggles between the on and off state) it results in upper case letters. There is usually a light on the keyboard to indicate whether Caps Lock is on or off.
Do NOT use the Caps Lock key in place of the Shift key when typing capital letters.
It is considered rude to type in CAPS (capital letters). IT IS ALSO MORE DIFFICULT TO READ TEXT THAT HAS BEEN TYPED IN CAPS RATHER THAN SENTENCE CASE.
Alt
The Alt key is used in combination with other keys. Holding down Alt and entering 277 on the keypad results in 
See the post Keyboard shortcuts to add language accent marks in Word for more.
Connection
PS/2 connectors were phased out in favour of USB connections for keyboards and other peripheral devices.
Wireless keyboards connected using Bluetooth technology are a popular choice.
Software settings
Available Windows 10 keyboard settings:
On-screen
For PCs or laptops equipped with touchscreens, the Touch Keyboard can be activated and used in place of a hardware keyboard. In the event of a keyboard failure on a standard computer, the Touch Keyboard can be operated using a pointing device.
Projection keyboard
A projection keyboard (or virtual keyboard) is a device that projects the image of a keyboard onto a flat workspace. The user then types on the surface using the projected keys as a guide.
Ergonomics
Ergonomic keyboards are available.
A standard USB keyboard offers better ergonomics than a laptop keyboard and I usually work with a USB keyboard (and mouse) plugged into my laptop.
See the post Ergonomics for more.
References:
- Wikipedia. Wikimedia Foundation (2023) QWERTY. Available at: https://en.wikipedia.org/wiki/QWERTY (Accessed: 3 November 2023).