How to read electronic schematic: https://learn.sparkfun.com/tutorials/how-to-read-a-schematic/all
Electronic Packages: https://en.wikipedia.org/wiki/List_of_integrated_circuit_packaging_types
Resistor: https://learn.sparkfun.com/tutorials/resistors/all
Capacitors: https://learn.sparkfun.com/tutorials/capacitors
Diodes: https://learn.sparkfun.com/tutorials/diodes
Transistor: https://learn.sparkfun.com/tutorials/transistors
i2c Communication: https://randomnerdtutorials.com/esp32-i2c-communication-arduino-ide
Soldering Through Hole: https://learn.sparkfun.com/tutorials/how-to-solder-through-hole-soldering/all
Soldering SMD: 1, 2, 3, 4, 5, 6, 7, 8
PCB Design With Eagle: https://learn.sparkfun.com/tutorials/using-eagle-board-layout/all