1. Check the link on your computer
At the back of the computer, you'll see possibly a round port, which is a PS2 port, or a rectangle one, which is a USB port. The type of port you have decides the type of relationship your keyboard must have so as to function.
You can also choose a wireless computer keyboard if your computer has Bluetooth functions. To find out if it does, go to the control panel on your computer and search for the icon that says "Bluetooth Devices." If you find the icon, you can simply add hardware such as a wireless keyboard by clicking on the "Add" button and following the instructions in the pop-up windows.
2. Figure out what type of keyboard is best for your purposes
Regular keyboards, also referred to as "QWERTY" keyboards because those letters are the first 6 on the left on the top row of letters, include the letters of the alphabet with the numbers 1 to 0 above them, punctuation symbols, a numeric keypad to the right, and a range of function keys. These keyboards are best for regular computer use that only requires typing and standard shortcuts for computer functions and instructions.
Ergonomic computer keyboards are particularly designed to minimize muscle strain and other musculoskeletal problems such as Repeated Strain Syndrome (RSI) that can be the result of long hours at the keyboard. Their keys are placed to follow the form of your hands and there's a large pad to support your palms and wrists at the bottom of the keyboard.
Gaming keyboards are like standard keyboards with extra features and functions. They have illuminated keys for playing at night, multimedia system keys to adjust the volume, palm rests to lessen the strain on your hands, and shortcuts so you can check mail and do other things while still playing computer games.
Laser or infrared keyboards are still in the beginning phase of development and aren't very user-friendly yet. A small device projects a keyboard onto your desk, and you type immediately onto the desk. Though this may be useful once perfected, at this time their usefulness is limited as they don't function as well as standard keyboards.
If you travel a lot, a roll up keyboard may be useful. This is made of polyurethane or silicone, and allows the user to simply roll the keyboard up after each use.
3. Check the keyboard of your choice for a suitable connection to your computer
If you want a keyboard that has a various type of connection from your computer, buy an adapter for the ports.
4. Make sure your computer can run the essential software
When you buy a keyboard, it might come with software you need to install in order to use special functionality keys. Check that the operating system on your computer meets the software's requirements.