Arduino practices

Here are some links and information about Arduino.

Introduction to electricity and Arduino (Ohm’s Law, etc.)
https://www.instructables.com/id/A-Beginners-Guide-to-Arduino/

A good introduction to Arduino, starting with a photograph with the explanation of pins and main circuits in the board.
https://www.makerspaces.com/arduino-uno-tutorial-beginners/ or better in pdf https://www.makerspaces.com/wp-content/uploads/2017/02/Arduino-For-Beginners-REV2.pdf

15 simple Arduino UNO projects:
https://www.makerspaces.com/15-simple-arduino-uno-breadboard-projects/
And the code of these projects:
https://www.makerspaces.com/wp-content/uploads/2017/06/Arduino-Project-Code.zip

Arduino language reference
https://www.arduino.cc/reference/en/
https://www.arduino.cc/en/Reference/HomePage2

The Spanish version is not complete :(
https://www.arduino.cc/reference/es/

First examples:
https://www.arduino.cc/en/Tutorial/BareMinimum
https://www.arduino.cc/en/Tutorial/Blink
https://www.arduino.cc/en/Tutorial/Button
https://www.arduino.cc/en/Tutorial/Fade and the sketch can be compared with this tutorial:
https://www.arduino.cc/en/Tutorial/Fading

Insertion of #include file with definition of notes. Array with notes and array with note durations, both array working together.
https://www.arduino.cc/en/Tutorial/toneMelody

Testing Analog inputs with a potentiometer or a photoresistor.
https://www.arduino.cc/en/Tutorial/AnalogInput