What rules of effective search for information on the Internet do you know?

It all depends on what exactly needs to be found and on what resource. If this is some kind of scientific topic, then the Wikipedia encyclopedia is best suited, where there is a lot of useful information. But in most cases, it is enough just to enter a correctly formulated query into the Google or Yandex search engine in order to find the information you need. There are also sites with textbooks, sometimes there will be useful information on a subject of interest, too, this option cannot be discounted. You can also look at the official sites of a particular company. It all depends on what you need to find.