They also help a lot when you need help choosing topics. Search engines search all of the Internet.
Search engines make little distinction between good and bad sites, clean and inappropriate sites.
For example, it is better to search for beagles and pets, mustang and car, law and Canada, Lemieux or Gretzky. Unless you have a very specific term such as aquaculture, cloning, Hitler, consider using Boolean operators to narrow the search. Another help in searching is the use of quotation marks around phrases, but be careful.