Linux and tools

• Shell simple commands, Bash
• Users, groups, permissions
• Vim
• Build process
• Git
• Gnu Make, GCC, G++
• GDB
• Valgring/Gprof
• Lcov/Gcov
• Doxygen

Electronics, PCB design

• Voltage, resistance, current
• Parallel vs Series connections
• AC/DC
• Documentation(data-sheet, reference manual, etc.)
• Resistor, capacitor, inductor
• Semiconductors
• Transistor(Mosfet/BJT/IGBT)
• Operation amplifier
• Modulation(PAM, PWM, PPM, etc)
• Protocols(USART, I2C, SPI, I2S, CAN)
• GPIO(Tri-state logic, high-impedance, pull-up/down, open-drain, etc)
• PCB design, Kicad IDE
• MCU/FPGA
• JTAG
• NVIC
• DMA
• Interrupts
• Flash/Nor/Nand/etc
• Timers
• Clock source(HSI, LSE, HSE, etc), clock configuration(PLL, prescaler)
• LUT/Flip-flop/slice/etc