w3schools is not the best resource, but 90% of the time, when it shows up as the top result on Google, it tells me exactly what I want to know.<p>Some common examples:<p>- What values does CSS attribute white-space take? #1 result on Google for "css white-space" is <a href="http://www.w3schools.com/cssref/pr_text_white-space.asp" rel="nofollow">http://www.w3schools.com/cssref/pr_text_white-space.asp</a> which has exactly what I need to know.<p>- What members does the Array object in JavaScript have? For the query "javascript array", the first result is an overview of what an Array is, but the second result is the object reference which is exactly what I need.<p>When learning, looking things up is one of the most common actions. Whenever w3schools comes up, it doesn't necessarily make me smile but it's reliable^Wconsistent so I know what to expect. It maintains a lot of utility, unlike good ol' experts-exchange.