In this post you will find great video tutorials for Arduino. I think it is a great starting point in the Arduino and IoT world. These tutorials could be useful for experienced developers.
Great thanks to the author and translators.
Tutorial 01: Getting Acquainted with Arduino
Tutorial 02: Buttons, PWM and Functions
Tutorial 03: Electrical Engineering Basics
Tutorial 04: Analog Inputs
Tutorial 05: Motors and Transistors
Tutorial 06: Serial Communication and Processing
Tutorial 07: I2C Communication and Processing
Tutorial 08: SPI Interfaces
Tutorial 09: Wireless Communication
Tutorial 10: Interrupts and Hardware Debouncing
Tutorial 11: SD Cards and Datalogging
Tutorial 12: RFID Card Reading
Tutorial 13: Liquid Crystal Displays (LCD)