Universal analytics tools allow tracking individual customers across devices by creating a unique identifier for each person. This helps analyze customer behavior based on device used and how behavior changes over time. Key metrics for analytics include unique visitors, new vs returning visitors, page views, average time on site, and bounce rate. Tools like Google Analytics are commonly used for tracking various digital marketing metrics. Setting goals and conversion rates in Google Analytics involves defining the goal, setting up the goal details and funnel steps, and accessing related reports.