As a start you can use a HUD by focusing on a few key stats like VPIP and PFR to gauge opponents’ tendencies. A high VPIP suggests wider starting hand ranges, while a high PFR indicates aggressive pre-flop play. Look for correlations between these stats and post-flop actions to refine range estimations. Compare opponent stats to general player tendencies and adapt accordingly. However, always consider the broader context and use the HUD as a guide while continually learning and adjusting your strategies based on observations and hand histories.