Below are some basic tips as well as some secrets that can be used on Google to help improve your search results and find things you may have never thought of.
Below are some more advance searches people are commonly looking for and what they do.
intitle:index.of + mp3 -asp -html -htm -php -pls -txt
In the above example, when entered into Google this search result looks for any index of MP3 files that does not contain the standard web pages like HTML, PHP, etc. or any other non-related pages. In the above example you can replace mp3 with avi or other file extension to search for these types of files.
intitle:index.of + mp3 "" -asp -html -htm -php -pls -txt
In the above example you could replace "" with the artists name, track, group, or name of the MP3 you're looking for. Keep in mind when downloading MP3 that you should own the track or song you're downloading otherwise it's considered illegal.
inurl:"ViewerFrame?Mode="
In the above simple example, Google will return results of insecure live web cams and with some of the services even allow you to control the cameras over the Internet.
The above three examples are just a few more advanced searches used to help illustrate how many different things can be found through Google.