A bit of a late post, but from my opinion the picture with the LED's on the breadboard in lesson 8 is not correct. The brown GND wire is, due to underlaying strip, directly connected with the kathode of the LED. Putting a resistor in between, to me it make no sense as still the full current will flow. The GND should be in a separate line and from there put a resistor in and connect it to the line of kathode of the LED.
thank you very much for noticing this! We initially already corrected this mistake but somehow the change was not implemented for the english version.
We will of course change that in our next update!
In the meantime, please use this image:
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