Arduino Tutorials - Examples is an Arduino tutorial with 64 examples. In this app contains ads and potentially in-app purchases, you can access content online for free at https://www.arduino.cc/en/Tutorial/BuiltInExamples.

You can read description & learn schematic on each example, and also practical directly by uploading code (.hex) to Arduino Uno board over USB/Bluetooth to see what happen. For the example need debugging, you can use Serial Monitor features.