I have no problems with and frequently use w3schools. I also find tons of programming content on other sites where people post code they are working on or tips.

I have no problems with and frequently use w3schools. I also find tons of programming content on other sites where people post code they are working on or tips. I don't know that I've ever really referenced Wikipedia for anything programming. I normally just do a Stack Exchange site search through google. I feel like this is the only area where Google search is still decent, but anything after the first page, maybe second is like literally nonsense.