The world is filled with information, but also a lot of misinformation, presented as if it were the truth. No single truth purveyor, no matter how reliable, should be considered an infallible source of accurate information.
Don’t just look at a usually-reliable source to do all of the thinking, judging, and weighing for you. People are people and people make mistakes and/or act from various motives and intentions.
Even professors may sometimes pass along unverifiable rumor as if it were the truth. And even textbooks frequently include numerous factual errors.
So always use your own mind, do your own research and check and double check the facts and sources of the things you read or hear.
Here are some tips to help you ..