Google is a search engine, which means that its only use is to search for and retrieve websites. Google does not create or verify content. It is useful to find information, but it will only find information that is freely available from other people on the internet. Google is useful for research when you know what you are doing your research on.
Google Scholar is a simple way to broadly search for scholarly literature. It allows you to search for both articles and case law, but its information ise not always free or current. However, it is another tool you can use.
Google has never publicly revealed its exact process for ranking websites, but it has given some details. Other details can be guessed based on what websites do successfully to gain a rank on the first page of a Google search. These include:
Google Advanced Search is a useful - if hidden - tool in Google. For example, you can search for: