Boards: The main boards-microcontrollers (e.g. Arduino Uno, Nano, Mega) that serve as the "brain" of your project, where you upload your code.
Shields: Expansion boards that fit directly on top of the main Arduino board (like a "floor"), instantly adding new features (e.g. Ethernet shield, Motor shield).
Uno: The most popular and classic Arduino board. It is the standard for beginners, students, and school projects, as it has the largest online community and ready-made code examples.
ESP8266: Affordable and very popular processor with built-in Wi-Fi. Ideal for connecting your projects to the Internet (e.g. sending weather data or remote control).
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