2d game for different screen resolutions

I want to develop a 2d game for mobiles. The concept will be like, the bubbles will be created at a random position and moves till top of the screen. Below are my questions.

  1. How to get a point(Vector3) with in the screen space.
  2. How to make my game support multiple resolutions.
  3. In recent versions of unity, there are anchors feature. But should i need to use a plane for all 2d unity games?
    I have been googling since a week but i could not find any answers. Request your help.

Hi,
You can find the solution at this tutorial
“[SOLVED] Full tutorial: Build 2D game fit to any device screen size, resolution in Unity 2018”
From youtube:

(By Vivu Standard).

Brgs,