Esp8266

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Rui Santos has an excellent ESP8266 Education / Project series here:

60+ ESP8266 NodeMCU Projects, Tutorials and Guides with Arduino IDE

About the ESP8266

The ESP8266 is a $4 (up to $10) Wi-Fi module. It allows you to control inputs and outputs as you would do with an Arduino, but it comes with Wi-Fi. So, it is great for home automation/internet of things applications.