What is the first step that Judi should take to serve ads to professionals who have visited her website?

Installing the Insight Tag is indeed the critical first step for Judi if she wants to serve ads to professionals who have visited her website. The Insight Tag is a piece of JavaScript code that allows for the tracking of website interactions and enables retargeting capabilities on LinkedIn. By incorporating this tag into her website, Judi can gather data on visitors, which is essential for building retargeting audiences. This data collection is foundational because it enables her to identify and re-engage users who have shown interest in her website, thereby making her advertising efforts more efficient and focused.

Once the Insight Tag is installed, she can move on to creating ad content, setting campaign objectives, and defining her target audience based on the insights gained. These subsequent steps are dependent on having the Insight Tag in place to understand who her audience is and how to best reach them with relevant messaging.