I am just a newbie to smart home and try to learn and build it with my own hands. Thanks for your advice and help!
With some great guys’ suggestion, I just bought a bunch of Liner WD500Z-1 wall switches and try to install it but found on my current wall switch it only has three wires - Black, White and bare copper-ground wire which I think is the most common wires in a residential house. But on Liner it has Black, White, Green-ground, and Blue. I know color to color wiring, but what to do with the blue wire?
The Liner installation video says the Blue wire connects to the load,
What should I do?