2. Computer principle and structure. At present, there are basically no electronic devices that do not use computers, so it is necessary to know computers, and it is best to be familiar with computers. Understand how the computer works, how the software works in the computer (it is best to write the program yourself), be familiar with the peripheral circuits and interfaces of common computer systems, and understand how the CPU and peripheral circuits work in harmony, etc. It is best to be familiar with MCS-5 1. Writing programs is not a problem. What matters is the idea, but you must do it.
3. PCB. The basic requirement is a four-layer board. We should understand the influence of PCB on EMI and ESD and find ways to avoid it. It takes time to train PCB beautifully and without problems.
4, VHDL language. This needs to master the basic skills abroad, and it is also popular in China. Mainly used for developing FPGA/CPLD devices and logic simulation, VHDL is often used as the input of ic design. For the time being, if you are not too demanding of yourself, you don't have to master it.
If time and energy permit, you can learn operating system, data structure and so on. Of course, you must master the C(C++) language first, so that you can work in the (software/hardware) system in the future. But the foundation of analog/digital electricity must be good, which is the basis of learning other things. At the beginning, we usually start with the analysis of the circuit to understand how the current flows in a circuit, how the voltage is generated, how the inductance and capacitance are discharged, and so on. From simple to complex, get into the habit slowly, and many things will be understood naturally.