Lois Leen gave a presentation on Google Analytics. She discussed the differences between the current Universal Analytics version and the new GA4 version, including pros and cons of each. She covered setting up a measurement plan, collecting data through the Google Analytics tracking code, and navigating the key reports for understanding audience, acquisition, behavior, and conversions. Leen also explained how to track events and configure goals to measure business objectives. The presentation included exercises for attendees to practice working with reports and setting up goals.