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I'm a bit of a noob in the Arduino area but I found an Arduino nano I bought a long time ago sitting on my shelf and collecting dust, so I taught "why not make a project". I game a lot of racing games so I wanted to make a simple ignition button with it, but every time I tried to compile or verify it, it says

Keyboard not found. Does your sketch include the line #include "Keyboard.h"

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    did you include the keyboard library from the Sketch menu? – dandavis Jun 17 '17 at 19:12
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    @dandavis - that would not be possible or at least not meaningful, as there is no such library for a nano. – Chris Stratton Jun 17 '17 at 21:39
  • @ChrisStratton: good call. – dandavis Jun 17 '17 at 23:27
  • Unlike and official Arduino Uno, which uses a re-programmable ATmega16U2 for an USB to UART interface, a Nano uses an non re-porgrammable FTDI chip. – gre_gor Jun 19 '17 at 13:44
  • A typical Nano has no hardware support for this - so you could only do it by a means such as software-approximate USB, or by adding a USB device interface chip. As the answer suggests, there are better platform choices. – Chris Stratton Mar 14 '18 at 17:01
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Get yourself a Arduino Leonardo, Micro or Pro Micro (or Due, Zero, M0). Those can emulate a keyboard.
Start with reading the Arduino Keyboard Mouse reference.

The Arduino Nano can not use the Arduino Keyboard Mouse library.

Since many years, there is a library called "V-USB" that requires some extra hardware and makes it possible for a ATmega328p microcontroller to act as an USB device. It is not something for a beginner.

A few years ago, Arduino has changed the way the USB is used. The NicoHood HID library makes use of the new possibilities. It makes it possible for example to have extended features for a USB keyboard, like the media keys.

For a normal keyboard and mouse, the Arduino Keyboard Mouse library will do. It will be perfect for a ignition button. But you have to buy one of those boards (Leonardo, and so on).

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