If you want to learn Bluetooth embeddedly, what do you need to learn? Can you describe it in detail?

If you want to learn Bluetooth, you need to learn the basic concepts of Bluetooth, such as the technical principles of Bluetooth, the physical layer of Bluetooth, the data link layer of Bluetooth, the transmission layer of Bluetooth, the session layer of Bluetooth, the application layer of Bluetooth, etc.; you need to learn the development of Bluetooth. methods, Bluetooth development tools, Bluetooth development environment, etc.; you also need to learn Bluetooth programming language, Bluetooth programming methods, Bluetooth programming skills, etc.