Finding sources is one thing -- evaluating whether the source is useful depends on whether the source is credible and provides facts or expert opinion appropriate for your research question.
The first step when viewing a resource is to scan it quickly and determine if it is going to be useful for your topic. Is it reliable? Is the content written at an appropriate level for you understand it? If so, set it aside to explore fully later, If not, move on.
Wentworth
Institute of Technology