Weak current engineer is a very general occupation, because weak current includes many systems: building automation, security alarm, video conference system, network integrated wiring system, access control system, automatic control system and so on. For you who have no foundation, I suggest you:

Understand national norms

First, I learned some national standards from textbooks (this is mainly for network wiring systems).

Understand weak current equipment

Secondly, you can learn about some weak current equipment. You can learn about their products from various weak current system companies. For example, if you know about cameras, you can pay attention to products from Dahua or Han Bang.

gather experience

For those who have no experience, you can apply for an assistant to the weak current project manager or go to the construction team to experience it and gradually accumulate experience.

Participate in training

Of course, you can also participate in some weak current system training, which is also a good choice for beginners. As for training institutions, you can refer to your local training institutions online.