How to make 2D Top-down shooter controller with camera follow?

How to make 2D Top-down shooter controller with camera follow (And camera follow cursor.)? Like a diep.io, etc. (But little bit different.)
Using movement key is WASD.

I'm planning college group task. (And my department is Computer Programming.) My teammates are 3 people including me. But my team does not much know how to write a script. They also have the same department as me.
I want to make a better game, but sometimes I get confused. Can somebody help me? (I'm still confused.)

I'm using Unity 2018.3.12f1 (x64 Windows).

 

Like a regular camera follow, but camera should actually follow a point inbetween the cursor and the player. You'll need the following.

1. create a Ray object going from camera through mouse cursor
2. Physics.Raycast that ray to the ground and find where on the ground the cursor points
3. lerp some position between the player and that point. 25% is nice, for example
4. move the camera to that position and offset up to the desired height
5. set camera forward vector to minus offset

 

Can you show example to me?

 

Of course. Look at the gameplay video, this is how I made camera for that game: https://store.steampowered.com/app/523740/Techwars_Global_Conflict/