Coding For Varying Screen Sizes

Good day. I have been struggling with how to code for varying screen sizes in Android. Many tutorials utilize GUI solutions, but I do not believe that would be appropriate for my 3D game (I use the Unity free version), but if it is, please let me know.

I’m not asking for a script dump how to scale my games (though I would love that!) I guess I’m just asking for some guidance as to how you all have overcome this challenge in the past, so at least I have some footsteps I can follow in. Right now I just feel like I’m spinning my wheels and it’s more than a little discouraging after many days.

Thanks!

Are you asking GUI guidance for different aspect ratios or gameplay related stuff for different aspect ratios?