You need not track and store every single user action on your eCommerce store. The primary events like add-to-cart, add-to-wishlist, removed-from-cart, product viewed, product display page viewed, checkout made, purchase made, and search made are to be tracked and stored for sure.

You can segment the user behavior data using a CDP, and send that data to any machine learning tool or analytics, understand the user behavior and predict the future behavior. Now, you can retarget your users with personalization leading to more conversions and increasing the LTV (Lifetime Value) of your customer.

You can use Google Analytics or a CDP like CustomerLabs CDP, to track your eCommerce store event data. The pixel code placed on your website will track all the user behavior. However, you should be concerned about how well that data is being tracked (for example, the data of the anonymous website visitors), and how better is the data being transmitted to the ad platforms.