Designing pages to scale with different screen sizes

[headintheclouds21]

I'm struggling to find a way to write the XAML in a way that scales with different mobile devices (iOS/Android). What are the best practices for designing a page to fit for various screen sizes? Is there a specific layout that's best for achieving this? I've tried with the VerticalStackLayout along with setting the Vertical Options to FillAndExpand and the Content Page is being shown as larger than the screen size with some of the controls being partially off the screen. Any advice is appreciated.