You cannot trust everything you find online- just like you cannot trust everything you find in the real world. You wouldn't believe everything you are told by a stranger so why would you believe everything you see on a website? Before you believe ANYTHING you should first apply your critical thinking skills!
You must learn about Website Evaluation and the criteria we should use to determine the CREDIBILITY of information.
CREDIBILITY: the quality of being believed as true, real, honest.
Below is a video that will introduce you to website evaluation:
In my classes, we use a method of source evaluation called the CRAAP method.
Below is a short video about the CRAAP method.