Where should I learn security monitoring?

You can go to the local security company or the security equipment sales point. Larger security equipment sales points generally also do equipment installation. You mainly need to learn the construction, installation and maintenance of weak current. It's not hard to be careful. You'd better prepare a small notebook to write down some things that you can't remember when you first entered the company, such as the connection of various ports, the color and distribution of lines, etc. ,,,