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Arduino Uno: The tiny mind that controls the robot

What is the main idea of this reading?

The author wrote "A binary signal is very useful when turning components on or off.".

What does "components" mean in this context?

The author wrote "The numbered pins ranging from 2–13 are able to emit binary signals emitting either 5 volts, or 0 volts.".

What does "ranging" mean in this context?

The author wrote "The Tx seen besides 1, is the transmitting signal, while the Rx seen besides 0, is the receiving signal.".

What does "transmitting" mean in this context?

Where is the bluetooth module connected?

Why are binary signals useful?