False Color Composites: 

Natural Color 4 3 2
False Color (urban) 7 6 4
Color Infrared (vegetation) 5 4 3
Agriculture 6 5 2
Atmospheric Penetration 7 6 5
Healthy Vegetation 5 6 2
Land/Water 5 6 4
Natural With Atmospheric Removal 7 5 3
Shortwave Infrared 7 5 4
Vegetation Analysis 6 5 4

In case of natural color composite i.e. RGB(4 3 2) 

Denser Plant Growth (Vegetation) appears dark red.
Agriculture appears as Light Red.
Water appears as Blue color.
Barren appears as white.
In case of RGB (5 6 4) 
Urban/ Built-Up appears as light purple color.
Water as Purple color.
LULC Supervised Classification in ArcGIS

LULC Supervised Classification in QGIS

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