Fundamentals (conductors, semiconductors, insulators, doping, band model, intrinsic conductivity)
Diodes (real characteristic curve, operating point, equivalent circuit)
Zener diode
LED
Protective circuit with diodes
Rectifier circuits (single-phase rectifier, center tap circuit, bridge rectifier, smoothing capacitor)
Bipolar transistor (structure, designations, characteristic curve, characteristic values)
Transistor as a switch (circuit, switching times and behavior)
MOSFET (structure, comparison with bipolar transistor)
Optional:
Transistor as an amplifier