What Mr. Burdette said is absolutely true: the internet is full of misinformation and lies, and many things that you read and watch online need to be verified by a reliable source. Much of the information is just repetition of errors from earlier works. Mr. Burdette researches his books using information gleaned from historical documents from the mint, and other places. Mr. David Lange, director of research at NGC, and a poster on this forum, is another trustworthy author whose books are a good addition to any numismatic library.
I am not saying that it is impossible, or even hard, to find reliable information on the web, you just need to make sure the source is trustworthy. Youtube, for example, seems to be full of sensationalist videos whose sole reason for existence is to get views. Probably best to stay away from there, when looking for information on coins.