I bought a new ceiling light and wired it myself. But I cheated by just copying the wiring from the old bracket into the new one. I want to do the other ceiling lights in my home. Supplied with the lights I am using is a 3 - way bracket (sori if terminology is wrong). Anyway the old bracket I copied was 4 way. My lights are wired from the mains supply with 3 live wires, 3 neutrals, and 3 positives. The light unit only has one live/neutral/positive wire. What do I do with the extra mains supply wires? I hope I have made myself clear as I even I am confused. Many thanks.
Sounds like you have extra wires that are feeding other outlets or lights.
One set of wires will be the mains feed the 2nd set will be the mains feed to the next light in the circuit and the 3rd set will be the switch wire. Copy like for like when changing them, taking care not to lose sight of the switch wire...