Extra peripherals
The Raspberry Pi is branded as a computer, and it is expected that we can connect various different devices to it. Raspbian is based on Debian, and an immense effort has been made to port the majority of drivers and software available for Raspbian. You might have some old USB peripherals lying around, for example, a joystick. If you can find a driver for any other Linux platform, it should be possible to make it work with Raspbian. Plug it in, use the lsusb command-line utility, and check whether it has been detected. If you manage to get it working with your knowledge, you should share this knowledge on a forum for the benefit of other users.
Essential peripherals
You should consider buying these peripherals and dedicating them ...
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