To ensure that your testing process is effective and efficient when using Kendo UI for cross-platform compatibility testing, you should keep some best practices in mind. For example, take advantage of Kendo UI’s responsive design features such as the Grid layout, Flex layout, and Media component to create flexible and adaptive UI layouts. You can also use the built-in themes, such as the Material, Bootstrap, or Default themes, or create custom themes with the Theme Builder tool to apply consistent and appealing styles across platforms. Additionally, take advantage of Kendo UI's data binding and validation features like the DataSource component, MVVM framework, and Validator component to manage data and handle user input. Furthermore, you can use Kendo UI's integration features like the Hybrid UI component, Cordova CLI, and NativeScript CLI to access native platform features and package your apps for deployment. Lastly, you can use Kendo UI's testing features such as the QUnit test runner, Mockjax library, and Test Studio plugin to create and execute tests within your development environment. You can also utilize testing tools and frameworks such as Selenium, Appium, Jasmine, Mocha, and TestCafe to automate tests on real devices or cloud-based services.