How to control the relay via usb or wifi?

Question

Programming

Tell me how to control the device (relay) from a computer (via USB or Wi-Fi).
The driver must connect to the Internet and receive commands from the server (or periodically send requests to the server). What should I use? I know only web technologies.
Maybe there are some programs and microcircuits or boards.
I also know nw.js - in fact a browser but with advanced features - it looks like an application - but I can only manage the window of this application, but I need a connected device.

Answer 1

Esp8266 is good for wifi. There are many implementation examples on the network, and there are also relays. Costs less than $2.