This category will teach you How To Install Hardware In General in general, by using some common hardware as examples, so that you see how easy installing hardware really is once the process has been explained/shown to you. After some time you should begin to realise that installing hardware on an apple mac computer is just a matter of plugging it in, waiting for OS X (Sierra) to detect it, and then installing its Driver software (the applications/files that communicate with the hardware) if necessary. This category will also teach you how to Disable Hardware and Remove Hardware the safe way among other things.
On top of this; Just because I show you an example of how to install a specific piece of hardware, such as the Canon MP495 Wireless Printer, doesn't mean you have to have that specific piece of hardware (i.e. printer) yourself in order to follow the examples - The examples serve the purpose of showing you common installation steps, that usually have common hardware/software features exampled/explained, whereby after following those common examples you should then feel more confident to install your own particular piece of hardware (i.e. wireless printer).
Hardware is split into two sections these days. Plug & Play and Plug & Detect.
Plug & Detect is the method whereby you plug in a piece of hardware, OS X (Sierra) detects it, but you have to install it. You install it using the driver file(s) from the Installation Disc (CD/DVD) that came with the hardware. If you don't have an Installation Disc you can always go to the hardware manufacturer's website to see if you can download the driver files (the software needed to make the hardware work), as well as any other software for the hardware (i.e. extra programs/utilities).
Plug & Play is the method whereby you plug in a piece of hardware, OS X (Sierra) detects it and then installs it for you. OS X (Sierra) can install the necessary driver files for you as it already has them on the computer. This could be because OS X (Sierra) is already supplied with them or because you have installed the hardware before, using the Plug & Detect method, and then uninstalled the hardware.
Depending on the uninstallation method the driver files could of been completely removed from the computer or just from the hardware's driver folder. If the latter happened OS X (Sierra) would still have a copy of the driver files in its own driver folder, which it could use to re-install the hardware without the aid of the installation Disc. Hence why I show you how to use the Hardware Wizard so you can locate your hardware's driver folder as well, if possible, and re-install hardware yourself.
Read the Installing Software section, if you have not already, as it gives advice on uninstalling and reinstalling software in general.