Positioning elements with multiple resolutions

Hi,

I'm learning Unity and I'm creating a mobile game which needs to be adapted to multiple devices (android/ios) with multiple resolutions and sizes.

After some researches, I did not find anything which could help me placing elements easily for multiple resolutions, and I have to define every positions for every resolutions I want the game to be adapted with. This is obviously taking a lot of time and I was wondering if maybe I'd have missed something.

So, is there any way to position easily elements for multiples resolutions? Like for example, a scene with textfields and a button ?

Thank you in advance