Way back in the day when I just started using Google and it's search I was a kid that only knew how to type query in the search bar and pray for the right result (and that search engine read my mind and understood what I meant).
Now it's all changed. Now I use special operators all the time because they really help with speeding up the search process (My ultimate favorite is [define:]).
Now bla showed me another one [music:] which is very useful if you're searching for an artist information, lyrics and etc.
There are many other search operators that I use on the regular basis but I'm not going to list them all here. Instead I recommend you follow this link to Google help page that has a list of all of them with short explanation.
It's like learning shortcuts for programs that you use most often: Once you try you don't understand how you have been living without them!