Unity is a cross-platform game engine developed by Unity Technologies, which is primarily used to develop both three-dimensional and two-dimensional(2D) and 3D video games and simulations for computers, consoles, and mobile devices

Unity Tutorial app collections of Categories are below and provide All Topic Like,
--=> Basic Unity Tutorial
Introduction
Getting Started
Learning the Interface
Assets
Game Objects
Components
Prefabs

--=> Scripting Unity Tutorial
Languages
Game Loop
Updeted Loop
Fixed Updated Loop
Testing the Game Loop
Time Delta Time
Instantiate

--=> Physics Unity Tutorial
Rigid Body
Physic Materials
Colliders
Character Controller

--=> Rendering Unity Tutorial
Camera
Skybox
Materials and Shaders
Lights
Lightmapping

--=> Important Tutorial
Unity Hotkeys
Unity Full E-Book
Etc...