Researchers write articles about their research and then publish them in Academic Journals. Then these Journals are available through Databases that the library purchases for your use.
Anyone can publish on the internet. They may or may not know their topic. In order to publish in a Journal, you must be an expert and meet specific standards in your area of expertise.
This means that you can trust what you read in a Journal Article.
The best databases will be those that fit your topic. If you are searching for a Science topic, then searching science databases would be your best bet. If you are writing a paper in a class that focuses on medical technologies, then a medical database would be the best place to start.
You can view the Subject Guide that fits your topic to find these resources.