What is the difference between creating a 3d game and 2d (Unity)?

Question

C++ / C#

What is the difference between creating a 3d game in Unity in C# and 2d? I found suitable tutorials without garbage, like "do everything like me", but a 3d game is created there.
Thanks in advance.

Answer 1

Well, for starters, 2D games use sprites, atlases, etc.
In 3D games, everything is much more complicated (relatively), other shaders, 3D models, and textures/materials are used.
To put it simply, the directions are different:
3D:
Vertex shaders.
3D meshes.
Skinning.
Rigging.
Textures, materials.
3D physics.
2D:
Atlases.
Sprites.
2D physics.
Pixel shaders. (Although there are also vertex ones)
Sprite animation.
In general, a different technology stack is used to create 3D and 2D games.