Each search tool has different rules - learn them. This can help exclude excess results, as well as rule out many potentially great ones. But, I tried to include enough to cover a wide range of interests and abilities. I would suggest browsing each of the topics in the contents, and only studying what you feel would be useful. Check out some of the links on my resources page, or use a guide for quality sources.
Nobody knows for sure, but a type of software known as information agents is very exciting.
They use artificial intelligence to help you find the answer to your questions.