GA4's standard reports don't lend themselves to answering questions. And customizing them is a bit of a pain. That's where GA4's Explorations comes in. It will help you take a look at custom user segments, and data points, that can help you answer questions about your customers, as well as create audiences for Google Ads. It's not a great data visualization tool, but it can help you answer questions about your marketing program performance, and user behavior.