Google Tools.

Today, Mr theobald taught us how to use Google tools, to find more precise sits, that are relevant to the topic/thing we are searching.

This is the "site" tool. It shows you results, only within the site we typed in. As you can see, all the results are of Wikipedia.
This are the "speech marks" and "negative" tools. It shows you results that have those exact words in the same sequence you requested. The negative signs, remove that from the google results.

These are some results you get, when you type in "why are clouds different colours?" without any google tools. As you can see, the results are completely irrelevant.

These are the number of results you are given, when you use no google tools.