While most of the CW's DC shows are all part of the same Arrowverse...
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Black Lightning takes place in its own isolated continuity.
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It has a more grounded, serious tone than the other Arrowverse shows, which crossover regularly.
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However, that could change with the upcoming Crisis on Infinite Earths crossover.
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In comics, that story merged several alternate universe into one DC Universe.
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Supergirl also started out in its own universe...
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But now crosses over with the other Arrowverse shows fairly often.
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Black Lightning's reality might merge with those of the other two Earths.
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