Google Books helps students locate and search inside books without having to track down a physical copy of each book that they are interested in reading. If students do want a physical copy of a book, Google Books can help them find a local library that has a copy of the book they desire. Those features of Google Books and more are demonstrated in my new video Five Things Students Should Know About Google Books.
Google Dataset Search is a search tool that is designed to help users locate publicly available datasets. This isn't a tool for searching within the datasets, it's a tool for finding datasets. For example, if you're doing research on earthquakes and want to find some datasets to analyze, Google Dataset Search will help you locate datasets that you could then open and or download to analyze. Watch the following short video to see how to use Google Dataset Search.
Google Scholar is probably best known as a search tool for locating peer-reviewed, academic papers. It can also be used to locate patent filings and to locate court cases. Those features and more are demonstrated in the following tutorials.