One of the best practices for micro frontends is to use a common state management system. This is useful because it ensures consistency in the application state across microfrontends. When different microfrontends have their own state management systems, it can lead to inconsistencies and make it difficult to maintain the application. By using a common state management system, developers can easily share data between microfrontends and ensure that the state of the application is consistent across all microfrontends.

An example of a common state management system is Redux. Redux is a predictable state container for JavaScript applications. It helps developers write applications that behave consistently, run in different environments (client, server, and native), and are easy to test. Redux can be used with any UI layer, including React, Angular, and Vue. By using Redux, developers can easily share data between microfrontends and ensure that the state of the application is consistent across all microfrontends.