They have something called an "editorial staff" and an "editor-in-chief", so everything that's written by one person, is at least checked and approved (or rejceted) by a group of people of the same profession, before it is published. If they do their job well, the newspaper earns something called a "reputation".
In an internet blog, however, every brainless idiot can write any kind of bullshit or nonsense they like, without being controlled, corrected or revised. I could pose as a brain surgeon and write a blog about the skull-screw method. No one would control me and many would probably believe me.
As far as opinion-forming is concerned, the internet is the medium of morons, wise-asses, extremists, grousers, conspiracy believers and narzissuses. So better stick to those, who gained a
reputation over decades, before the internet existed.
99.9 % of all blog scribblers lack that reputation and/or a journalistic background. It can be fun to read them but you should never ever take everything for granted, what they write.
Thinking about it, you should never take anything for granted everywhere, but the chances of reading the truth are bigger, when you resort to reknowned news meda.