You can evaluate any source using the 5 W's:
When you see a claim that may not be 100% true, there are four steps, called "moves," you can take to fact-check the claim. If you successfully confirm a fact at any stage, you can stop - it's not always necessary to complete all four moves.
In addition to the fact-checking moves, you should get into the habit of checking your emotions. When you feel strong emotion – happiness, anger, pride, vindication – in response to a claim, STOP. Above all, these are the claims that you must fact-check.
As human beings, our emotions tend to override our ability to reason. It's important to learn to recognize when this is happening, so you can approach important issues with a more analytical frame of mind.