Experience of credibility with a source. If you know a news site is credible, then it’s appropriate to trust at least most things.

If it’s a journal or a blog, then it’s most likely opinion with no real substantial evidence.

Experience of the writer of the source. A lot of official articles will have a small bio about the writer or at least their name so you can research the writer.

Citations. That’s all on that point

Site security. If it’s an unsecured site, then it is not a good source of information

Verbiage. If bias or insulting language is being used, then it’s a bias source which makes it a bad source.