The following two sites are electronic manufacturers and they both feature a wide range of entry-to-mid-level tutorials. They focus on the practical aspects of electronics and don't bombard you with too much theory. Try a search for Raspberry Pi on their sites:
In relation to the concepts that we have covered in this chapter, here are some specific links on the aforementioned sites:
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All About LEDs: https://learn.sparkfun.com/tutorials/light-emitting-diodes-leds
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Ohm's Law, Power, and Kirchhoff's Law Primer: https://learn.sparkfun.com/tutorials/voltage-current-resistance-and-ohms-law
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Voltage Dividers: https://learn.sparkfun.com/tutorials/voltage-dividers
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Pull-Up/Down Resistors: https://learn.sparkfun.com/tutorials/pull-up-resistors/all
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Resistors and Color Codes: https://learn.sparkfun.com/tutorials/resistors
If you want to go deeper, the following two websites...
