How do I support diferent screen sizes

I've read this manual https://www.scirra.com/tutorials/73/sup ... zes/page-1

However (maybe because my english is not that great) I think I didn't understand.

The manual is saying that, in order to support all mobile resolutions I need to focus the aspect ratio, right?So if I use 1280,720 and on start of layout set layout scale to 1 I would have the same view of the game If I had used 1920,1080? I'm quite confused

This is the tutorial I used and is the method I continue to use to ensure every device is covered. It's not failed me yet. There may be better methods out there, I'm just sharing the one I use.

https://www.scirra.com/tutorials/1126/multiple-screen-sizing-for-all-mobile-devices

It's pretty easy to follow, just make sure you read it all properly and don't just skim over it looking for what you think you need.

This is the tutorial I used and is the method I continue to use to ensure every device is covered. It's not failed me yet. There may be better methods out there, I'm just sharing the one I use.

https://www.scirra.com/tutorials/1126/multiple-screen-sizing-for-all-mobile-devices

It's pretty easy to follow, just make sure you read it all properly and don't just skim over it looking for what you think you need.

But It wont work if I use different layout sizes since we center the safe zone using the layout size, right?

Maybe cheking what layout is running everytime?