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I have geocoded a series of addresses using ArcMap 10.5. The Geographic Coordinate System under the properties is:
Geographic Coordinate System: GCS_WGS_1984 Datum: D_WGS_1984 Prime Meridian: Greenwich Angular Unit: Degree
I just want to confirm that the EPSG code for this is 4326, because when I did some googling I ran into a lot of EPSG codes for slightly different variations of the projection WGS 84, and am a bit confused as a result
Yes, 4326 is the standard epsg code for latitude/longitude geographic coordinate system using the WGS 84 datum.
Looking at the link you included I think you may be confusing geographic vs projected coordinate systems and datums vs coordinate systems. A datum is basically a model of the Earth (base ellipsoid model combined with geoid model of sea level).
A geographic coordinate system takes the datum to describes locations on that datum in terms of spherical coordinates (e.g. latitude/longitude). EPSG 4326 describes the geographic coordinate system using WGS 84 and the Greenwich meridian.
A projection can then be used to flatten the spherical 3D Earth into a 2D map. They all are built off of a geographic coordinate system and datum.
If you want to read further, Esri has a good blog post on some of these geodesy nuances.
