Arduino Nano
The most commonly used Arduino boards for learning or hobby projects are the Arduino Uno and the Arduino Nano. They are both quite similar in function but are very different in size and shape. The Uno is larger and does not need a breadboard wheras the Nano is smaller and fits into a breadboard.
We will be using an Arduino Nano in most of our projects.
The basic Nano does not have WiFi or Bluetooth communication capability. If you need that, an external module will have to be added. If you need in-built WiFi or Bluetooth use the ESP32 board.
See the Nano Board Pinout and Pin Functions guide which is a must-have reference when assembling circuits.