Terminology

Meshes vs Textures

A mesh is the 3D shape of a model, while the texture is a sheet that acts like a skin lying on the surface of the model upon which you can paint detail. Consider a model airplane; the body that is glued together is the mesh, and the paper with decals on it that gets wrapped around the body is the texture (source: https://forums.nexusmods.com/index.php?/topic/554645-difference-between-textures-and-meshes/?p=4504070).

Prefabs

A prefab is a stored collection containing one or more complete game objects with components that are attached and have set properties.

Physically-Based Rendering (PBR)

Base color/Albedo/Diffuse

The literal color of areas on a given space of your textures.

Metallic

The ability of your surface to reflect the imagery around it. Black = nonmetal, white = fully metallic.

Roughness

The ability of your surface to reflect or absorb white light. Black = not rough, white = fully rough.

Normals

Determines the illusion of depth and features.

Height

The fake depth or height of areas on your map.

Ambient Occlusion

Determines which areas are inherently darkened to simulate shadows.