Watch for signature moves. Asymmetric labeling buries judgment inside neutral-sounding reporting. One side's gathering is a 'protest,' the other's a 'riot'; one side's expert is a 'researcher,' the other's an 'activist'. Placement bias leads with the preferred framing and buries the inconvenient finding. And omission bias, meaning simply not covering what complicates the narrative, is invisible from inside one outlet but obvious across several.
The countermeasure is to read across outlets with different known biases, focus on the parts of the story where they disagree (that's where the information is), and force yourself to read at least one source you find irritating. Separate the factual claims from the interpretive frame in your own head as you go. For broader treatment, see Media Literacy.