When searching online through a search engine like Google, it can be hard to know what might be a legitimate source that is appropriate to use in a paper. Results in Google can be tied to your previous searches and other collected data, which can skew results so that relevant information is buried. Rather than doing general searches in a search engine you may want to rely on going to specific websites. 

A good way to know where to search is to think about who might be interested in your topic you are researching and the type of information you are seeking. If you are looking for data or statistics, governments at all levels can be good places to start. If you are focusing on health-related issues, the National Library of Medicine or the World Health Organization may have helpful publications. If you are looking for academic primary sources, libraries and universities around the world may maintain digital or physical collections. Non-profits, intergovernmental organizations and think tanks can also be good sources of information. 

Google Scholar can be searched when you are trying to find literature on a topic and you are not sure where to start. However, keep in mind that no one knows what is in Google Scholar and what is not in Google Scholar. This can make it difficult to know if you are missing important literature. It also does not have a robust advanced search options and typically you will get thousands of results in no particular order. It isn't a good option to rely on for all your literature searching, so if used, make sure to use subject databases for more in-depth searching options.