It's like intelligence analysis. You get various bits of intel. Some are true, some are false, some are biased, some are fake. Intel is evaluated in terms of source reliability and information credibility, which are separate.

Bracketing helps. If China Daily and Breitbart News agree on something, that's reasonably solid. But check to see if they're getting their info from the same place. Distinguish between two independent sources and two paths from the same source.

When both sides are too far apart, digging for more data is needed. It's often available, and best obtained from sources close to the situation. Not pundits.

Recognize that you're not going to be sure. Accept that and realize that the goal is to get good enough quality information to make a decision. Being too sure is an error of its own.

Here's a basic article on the subject from the CIA.[1] Much of this is about the problems of being too sure.

All of this is way too much work for most people.

(This is not something I've done professionally. I have worked with people who did.)

[1] https://www.cia.gov/resources/csi/static/Article-Principles-...