Created by Greg Berlanti, the Arrowverse started as one small Arrow/Flash universe, and has now become a franchise taking place on Earth-1. Shows like Supergirl and Black Lightning are not canon to the Arrow/Flash universe because they didn't originally air on the CW. After Crisis on Infinite Earths (note: this link leads to the comic), they both take place on Earth-Prime, but it's almost exactly like Earth-1 due to the Spectre.
Shows included in this post-Crisis Earth-Prime are:
Earth 2:
Earth 9:
Earth 19:
Earth 21:
Earth-TUD25:
Notable Parallel Earths from Pre-Crisis:
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