Two facts that are constantly reported in this and other forums, yet are absolutely false:
1. Just being in the same room with a gun, WD-40 can ruin it forever, coating it in rock-hard shellac and rotting the wood;
And, 2. S&W nickle plating is as delicate as the inner flesh of a virgin's thighs, and virtually anything, especially gun oils and cleaners, will ruin it.
Both of these assertions are bona fide hogwash. WD-40 is an excellent water-displacement agent, a pretty fair rust preventive, and a lousy lubricant, but used properly it will do absolutely no harm to a gun. S&W nickle plating is not and has NEVER been plated over copper, and soaking it in Hoppe's No. 9 for a lifetime will not hurt it.
You will get superb collector information on this forum. You can get some valuable practical info, too -- but a lot of it is pure, one-million-times-repeated hokum, too...