There are three types of minor scales - Natural minor, Harmonic minor and Melodic minor.
Harmonic minor - Raised 7th
Melodic minor - Raised 6th and 7th
In the melodic minor, you only raise the 6th and 7th when going up. You use the natural key when going down.
There are 7 modes in total. The major and minor are just two of the modes that are the most common.
There seven modes - Ionian(Major), Dorian, Phrygian, Lydian, Mixolydian, Alolian(minor), Locrian.

A geometry represents a shape. Material represents the texture. You apply a texture to a geometry to create a mesh.
A geometry just defines the mathematical rules of a shape and hence can be reused.
A triangle is the smallest building block in the threejs and probably all other 3d modeling tools as well.

Today I learnt