I need some information on how messages are transferred electronically on a computer network, what are the inputs and outputs and how do encoders and decoders work to pass messages from one computer to another?

How would messages be transferred electronically to a stand alone computer and how would encoders and decoders work?

How can messages be transferred electronically from a computer to a pheripheral device, such as a printer. How does the encoding and decoding work?

what is the difference between input and output transducers?

What is the baud rate in a computer network, stand alone computer, pheripherals, output and input transducers.

I will be grateful for any information