Comments: Polarity
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This page introduces the schematic representation of a Diode with the Anode (+) on the Left side and the Cathode (-) on the Right side.
Then in the photographs, every example shows the Cathode (-) of the Left side and the Anode (+) on the Right side.
You should consider flipping the drawing on the photographs around such that they are uniform in their sides. It will facilitate better learning and less confusion.
Cheers.