In fact, the process of learning embedded system is very long. I have heard a lecture before and talked about the relevant knowledge needed by embedded systems.

1, analog and digital electricity

2. Principle of microprocessor

3. CAD drawing tool (protel99se ...)

4. Can weld

5, single chip microcomputer

6, computer principle

7、C/C++

8. Operating system

9, data structure, database

...

I forgot something,

If you are looking for a job quickly, I suggest you don't learn from scratch, buy a development board and practice while learning, and then make up what kind of knowledge you need.

Embedded system has a lot of work to do.

What application software engineer, driver engineer, system engineer, hardware engineer, software testing, these are many.