Overview screens and dashboard screens are not only the first thing your users will typically see, but they're also the most common point of contact with your user. They need to be functional, beautiful, and also very fast. An application that takes too long to load its first screen will only frustrate its users. If your application is frustrating to users, they will avoid using it. As such, it's very important to consider what information your user will need, and what are the most important actions they will take from the overview screen.
The Material Design guidelines have excellent recommendations to help you decide on these aspects of your application, which in turn will help you produce better applications. Remember that while it's fun (and important) to get creative with your designs, it's also very important to stick to the rules. Common patterns in design help your users understand what you're asking them to do, and how to use your application. This understanding...