Yes, it is dangerous to believe everything you hear. Because nowadays, every business uses media to its advantage. The majority of businesses use the media to spread false information in the market for their own benefit. As a result, believing in every piece of news is never a good strategy.
Do not believe in everything that you see not just in the news but also in social media and in other different media. Because it's a huge business and you see big article producers, they're paid a lot to hype something about a business or a company or a project that wants to advertise just the way they promote.
Instead, you should verify the authenticity of all news and opinions before making any decisions based on them.
That's the key, verify, verify and always verify! You're on your own and there's no other people that might correct you on some false news but only you by researching and finding out if there's a fault or lack of authenticity from the produced article/news.