You try sources starting with your judgement as to which is best. Then you pursue links that seem promising. That's the best way to search on the web. The Web is great. They're just not great the same way.
Libraries are great for structured searching.
They are indexed collections of a variety of media. The index is the key. The Web is more like a room full of people than it is like a library. Those people know things. They have documents in their files.