Are all informations reliable?

I don't think ALL information are reliable, because they may just come from the Internet, some of them may be lies, or such bizarre. Example like on Wikipedia, people who have accounts there could always change the given information. And also for BBC, which is a really trustful website for a lot of people around the world, made a video saying penguins can fly. But is that really true? No. Also for a website like Dog Island or something,a dn that's also not true.