Connecting the 2-way switch

Connecting the 2-way switch
Connecting the 2-way switch to control the closure The opening of the lamp inside the house More convenient for users in the case of a 2-storey house. This type of switch is usually referred to as "stair switch".
For the connection method, use it as per the picture below.
https://content108.blogspot.com/2018/08/2.html