First of all, This example give us information that is how much it will cost to make it.
It says total cost for this project is about $ 150. Also there are Components info that all you need and Youtube/Github link.
If you want to make an IoT Smart home, It will be nice :)
An Arduino and Ethernet shield are used as a web server to host a web page that contains a text box. Text can be typed into the web page text box using a web browser and sent to the Arduino by clicking a button on the web page.
This tutorial explains about the wiring and testing the different boards of arduino with the Ethernet shield.We will focus on how to wire Arduino UNO R3 to Arduino LAN Ethernet Shield R3 and Arduino MEGA R2 to Arduino LAN Ethernet Shield, then test whether it works or not.