Sparkfun , which is an excellent purveyor of microelectronics (including Raspberry Pis and Arduinos), has a very nice tutorial that useful forhttps://learn.sparkfun.com/tutorials/how-to-read-a-schematic.
Drawing Electrical Circuits (Symbols)
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Symbols used in schematic diagrams. From Sparkfun.
Middle and High School … from a Montessori Point of View