How a 2 Way Switch Wiring Works? | Two-Wire and Three-Wire Control
How to Run Two Lights From One Switch : Electrical Online
2 Way Switching - DIYWiki
Kasa Smart 3 Way Switch HS210 KIT, Needs Neutral Wire, 2.4GHz Wi-Fi Light Switch works with Alexa and Google Home, UL Certified, No Hub Required, White,2 Count (Pack of 1) : Amazon.co.uk: