About the wiring of the bedside switch to control the bulb

Your understanding is absolutely correct! Compliance with wiring requirements also facilitates practical operation. The so-called "zero line of fire...... walk side by sideIt is a mantra of wiring rules in the textbook, and your understanding is consistent with the requirements of this mantra.

The actual operation sequence is not to lead out the neutral wire and the live wire from the power supply first, but to connect the lamp head first as you said, and then disconnect one of the wires, connect the two disconnected wires to the switch, and finally just pay attention to connect the wire head from the switch to the live wire of the power supply, and the other wire to the zero line.

About the wiring of the bedside switch to control the bulb - is it the neutral line of the live wire directly connected to the lamp head, and then go to the switch to cut the live wire, and the 2 sides lead to the 2 ports of the switch, is this the case? - Quite right

Wrong. Two dual-control switches are required, and the wiring diagram is as follows:

Yes. It is the neutral wire that is directly connected to the lamp head, and the live wire is connected to the lamp head after the switch.

The zero line of the live wire goes side by side, the zero line directly enters the lamp holder, and the live wire enters the lamp holder through the switch.

How to deploy the master control switch at the head of the bed in the hotel room.