It's really not easy to study the embedded direction by yourself. I know a university teacher in Shaanxi. I bought a board and played it for two years, but there are still problems in teaching. Personally, the teacher's difficulty is that he has been groping and learning by himself, rather than doing real projects. The teacher finally went to an institution for further study. I think I went to the top mosaic.

So I think you should be careful, the topic should not be too deep, it is best to be simple, such as interface or some application development, and then slowly explore.

Personal point of view ...