How to create a game like Avakin life/Spatial using unity?

I'm very curious to know the game making process of Avakin life / Spatial which are made using unity . If someone can suggest me on what documentation I should go through or additional technologies that I should learn for making a game like would be very helpful

 

Well, that is a broad question. I'd say start by learning Unity basics.

I only skimmed over the game, it seems like much of it is UI and placement of objects in 3D space. That shouldn't be too hard to replicate with some basic Unity GUI and 3D object handling with raycasting to find target (usually the floor, or to disallow placement).

 

I'm not familiar with these games that you mention, but just a brief look, it looks like these are pretty-broadly featured games and are going to require a little bit of everything.

So to recreate such a game (or really any game) is really the same- Learn Unity's systems. Learn how to code. Learn to make assets.